diff --git a/package-lock.json b/package-lock.json
index ef478dd..dc100c5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2783,6 +2783,7 @@
           "version": "0.0.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "inherits": "~2.0.0"
           }
@@ -2807,7 +2808,8 @@
         "buffer-shims": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "caseless": {
           "version": "0.12.0",
@@ -2824,12 +2826,14 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "combined-stream": {
           "version": "1.0.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "delayed-stream": "~1.0.0"
           }
@@ -2842,17 +2846,20 @@
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "cryptiles": {
           "version": "2.0.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "boom": "2.x.x"
           }
@@ -2892,7 +2899,8 @@
         "delayed-stream": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "delegates": {
           "version": "1.0.0",
@@ -2924,7 +2932,8 @@
         "extsprintf": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "forever-agent": {
           "version": "0.6.1",
@@ -3047,6 +3056,7 @@
           "version": "3.1.3",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "boom": "2.x.x",
             "cryptiles": "2.x.x",
@@ -3094,6 +3104,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "1.0.1"
           }
@@ -3107,7 +3118,8 @@
         "isarray": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "isstream": {
           "version": "0.1.2",
@@ -3180,12 +3192,14 @@
         "mime-db": {
           "version": "1.27.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "mime-types": {
           "version": "2.1.15",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "mime-db": "1.27.0"
           }
@@ -3261,7 +3275,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "oauth-sign": {
           "version": "0.8.2",
@@ -3319,7 +3334,8 @@
         "process-nextick-args": {
           "version": "1.0.7",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "punycode": {
           "version": "1.4.1",
@@ -3357,6 +3373,7 @@
           "version": "2.2.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "buffer-shims": "~1.0.0",
             "core-util-is": "~1.0.0",
@@ -3408,7 +3425,8 @@
         "safe-buffer": {
           "version": "5.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "semver": {
           "version": "5.3.0",
@@ -3432,6 +3450,7 @@
           "version": "1.0.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "hoek": "2.x.x"
           }
@@ -3465,6 +3484,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -3475,6 +3495,7 @@
           "version": "1.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.0.1"
           }
@@ -3503,6 +3524,7 @@
           "version": "2.2.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "block-stream": "*",
             "fstream": "^1.0.2",
@@ -3558,7 +3580,8 @@
         "util-deprecate": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "uuid": {
           "version": "3.0.1",
diff --git a/src/Field.vue b/src/Field.vue
index c22f639..145a220 100644
--- a/src/Field.vue
+++ b/src/Field.vue
@@ -1,14 +1,12 @@
 <template>
   <div id="field" :class="daytimeClass">
     <input v-keep-focussed type="text"
-      @keydown.up="player_velocity_y = -8"
-      @keydown.down="player_velocity_y = 8"
+      @keydown.up="jump = jump ? jump : 16"
       @keydown.right="player_velocity_x = 8"
       @keydown.left="player_velocity_x = -8"
-      @keyup.up="player_velocity_y = 8"
-      @keyup.down="player_velocity_y = 8"
       @keyup.right="player_velocity_x = 0"
       @keyup.left="player_velocity_x = 0"
+      @keypress.p="togglePause"
     />
     <mountain-background :x="128 + x / 8" :time="time" />
     <div id="wrap" :style="{transform: `translate(${tx}px, ${ty}px)`}">
@@ -17,13 +15,18 @@
       </template>
     </div>
     <div id="player" :class="[player_direction]" />
-    <div id="level-indicator">x:{{ floorX }}, y:{{ floorY }} ({{clock}})</div>
+    <div id="level-indicator">
+      x:{{ floorX }}, y:{{ floorY }}
+      <template v-if="moving !== false">({{clock}})</template>
+      <template v-else>(PAUSED)</template>
+    </div>
   </div>
 </template>
 
 <script>
 // import throttle from 'lodash/throttle'
 import Level from './level'
+import Player from './player'
 import MountainBackground from './Background'
 
 const BLOCK_SIZE = 32
@@ -42,7 +45,8 @@ export default {
       y: 0,
       player_direction: 'left',
       player_velocity_x: 0,
-      player_velocity_y: 9,
+      player_velocity_y: 8,
+      jump: 0,
       gravity: 8.0 / 20,
       moving: false,
       time: 250
@@ -62,22 +66,30 @@ export default {
     }
   },
   computed: {
-    blockAtPlayer () { return this.rows[PLAYER_Y][PLAYER_X] },
-    blockLeftOfPlayer () { return this.rows[PLAYER_Y][PLAYER_X - 1] },
-    blockRightOfPlayer () { return this.rows[PLAYER_Y][PLAYER_X + 1] },
-    blockAbovePlayer () { return this.rows[PLAYER_Y - 1][PLAYER_X] },
-    blockBelowPlayer () { return this.rows[PLAYER_Y + 1][PLAYER_X] },
-    blockedUp () { return !this.blockAbovePlayer.walkable },
-    blockedDown () { return !this.blockBelowPlayer.walkable },
-    blockedLeft () { return !this.blockLeftOfPlayer.walkable },
-    blockedRight () { return !this.blockRightOfPlayer.walkable },
+    rows () { return level.grid(this.floorX, this.floorY) },
+    surroundings () {
+      const at = this.rows[PLAYER_Y][PLAYER_X]
+      const left = this.rows[PLAYER_Y][PLAYER_X - 1]
+      const right = this.rows[PLAYER_Y][PLAYER_X + 1]
+      const above = this.rows[PLAYER_Y - 1][PLAYER_X]
+      const below = this.rows[PLAYER_Y + 1][PLAYER_X]
+
+      const blocked = {
+        at: !at.walkable,
+        left: !left.walkable,
+        right: !right.walkable,
+        above: !above.walkable,
+        below: !below.walkable
+      }
+
+      return { at, left, right, below, blocked }
+    },
     cornerX () { return this.x === ~~this.x }, // cornering a block
     cornerY () { return this.y === ~~this.y },
     floorX () { return Math.floor(this.x) },
     floorY () { return Math.floor(this.y) },
     tx () { return (this.x - this.floorX) * -BLOCK_SIZE },
     ty () { return (this.y - this.floorY) * -BLOCK_SIZE },
-    rows () { return level.grid(this.floorX, this.floorY) },
     daytimeClass () {
       const t = this.time
       if (t >= 900 || t < 80) return "night"
@@ -109,46 +121,40 @@ export default {
 
       // this.player_velocity_y += this.gravity
       let vx = this.player_velocity_x * RECIPROCAL
-      let vy = this.player_velocity_y * RECIPROCAL
+      let vy = (this.player_velocity_y - this.jump) * RECIPROCAL
+
+      if (this.jump > 0) this.jump--
 
       // change player graphic according to direction
       if (vx < 0) this.player_direction = 'left'
       if (vx > 0) this.player_direction = 'right'
 
       // don't walk / fall into blocks
-      if (vx > 0 && this.blockedRight) vx = 0
-      if (vx < 0 && this.blockedLeft) vx = 0
-      if (vy > 0 && this.blockedDown) {
-        // jump to the top of the block
-        vy = -((~~y + 1) - y) + 1
-        // vy = 0
-      }
-      if (vy < 0 && this.blockedUp) vy = 0
+      const { blocked } = this.surroundings
+      if (vx > 0 && blocked.right) vx = 0
+      if (vx < 0 && blocked.left) vx = 0
+      if (vy > 0 && blocked.below) vy = 0
+      if (vy < 0 && blocked.above) vy = 0
 
       this.x += vx
       this.y += vy
-      this.moving = setTimeout(() => this.move(), 50)
+      this.moving = setTimeout(() => this.move(), 64) // roughly every 4 frames
     },
+    togglePause () {
+      if (this.moving === false) { // is paused
+        this.moving = true // avoid (unlikely) race condition
+        this.move()
+      } else {
+        clearTimeout(this.moving)
+        this.moving = false
+      }
+    }
   }
 }
 </script>
 
+<style src="./assets/field.css" />
 <style>
-#field {
-  position: relative;
-  width: 1024px;
-  height: 1024px;
-  margin: auto;
-  overflow: hidden;
-  background-color: #56F;
-}
-#field > input {
-  position: absolute;
-  opacity: 0;
-  display: block;
-  width: 1px;
-  height: 1px;
-}
 #level-indicator {
   position: absolute;
   top: 0;
@@ -183,49 +189,4 @@ export default {
   display: flex;
   flex-flow: row wrap;
 }
-.block.grass   { background-image: url(./assets/grass01.png); }
-
-.block.tree_top_left     { background-image: url(./assets/tree_top_left.png); }
-.block.tree_top_middle   { background-image: url(./assets/tree_top_middle.png); }
-.block.tree_top_right    { background-image: url(./assets/tree_top_right.png); }
-
-.block.tree_crown_left   { background-image: url(./assets/tree_crown_left.png); }
-.block.tree_crown_middle { background-image: url(./assets/tree_crown_middle.png); }
-.block.tree_crown_right  { background-image: url(./assets/tree_crown_right.png); }
-
-.block.tree_trunk_left   { background-image: url(./assets/tree_trunk_left.png); }
-.block.tree_trunk_middle { background-image: url(./assets/tree_trunk_middle.png); }
-.block.tree_trunk_right  { background-image: url(./assets/tree_trunk_right.png); }
-
-.block.tree_root_left    { background-image: url(./assets/tree_root_left.png); }
-.block.tree_root_middle  { background-image: url(./assets/tree_root_middle.png); }
-.block.tree_root_right   { background-image: url(./assets/tree_root_right.png); }
-
-.block.tree_top_left_mixed     { background-image: url(./assets/tree_top_left_mixed.png); }
-.block.tree_crown_left_mixed   { background-image: url(./assets/tree_crown_left_mixed.png); }
-.block.tree_trunk_left_mixed   { background-image: url(./assets/tree_trunk_left_mixed.png); }
-.block.tree_root_left_mixed    { background-image: url(./assets/tree_root_left_mixed.png); }
-
-.block.tree_top_right_mixed    { background-image: url(./assets/tree_top_right_mixed.png); }
-.block.tree_crown_right_mixed  { background-image: url(./assets/tree_crown_right_mixed.png); }
-.block.tree_trunk_right_mixed  { background-image: url(./assets/tree_trunk_right_mixed.png); }
-.block.tree_root_right_mixed   { background-image: url(./assets/tree_root_right_mixed.png); }
-
-.block.soil    { background-image: url(./assets/soil.png); }
-.block.soil_gravel { background-image: url(./assets/soil_gravel.png); }
-.block.stone_gravel { background-image: url(./assets/rock_gravel.png); }
-.block.stone   { background-image: url(./assets/rock.png); }
-.block.bedrock { background-image: url(./assets/bedrock.png); }
-.block.cave    { background-color: #000; }
-#field .block:hover { outline: 1px solid white; z-index: 10; }
-
-.morning0 .block, .morning0 #player { filter: saturate(50%) brightness(0.6) hue-rotate(-10deg); }
-.morning1 .block, .morning1 #player { filter: saturate(100%) brightness(0.8) hue-rotate(-20deg); }
-.morning2 .block, .morning2 #player { filter: saturate(200%) hue-rotate(-30deg); }
-
-.evening0 .block, .evening0 #player { filter: brightness(0.8) hue-rotate(-10deg); }
-.evening1 .block, .evening1 #player { filter: brightness(0.6) hue-rotate(-20deg); }
-.evening2 .block, .evening2 #player { filter: brightness(0.4) hue-rotate(-10deg) saturate(50%); }
-
-.night .block, .night #player { filter: brightness(0.3) saturate(30%); }
 </style>
diff --git a/src/assets/field.css b/src/assets/field.css
new file mode 100644
index 0000000..620b4b2
--- /dev/null
+++ b/src/assets/field.css
@@ -0,0 +1,60 @@
+#field {
+  position: relative;
+  width: 1024px;
+  height: 1024px;
+  margin: auto;
+  overflow: hidden;
+  background-color: #56F;
+}
+#field > input {
+  position: absolute;
+  opacity: 0;
+  display: block;
+  width: 1px;
+  height: 1px;
+}
+.block.grass   { background-image: url(./grass01.png); }
+
+.block.tree_top_left     { background-image: url(./tree_top_left.png); }
+.block.tree_top_middle   { background-image: url(./tree_top_middle.png); }
+.block.tree_top_right    { background-image: url(./tree_top_right.png); }
+
+.block.tree_crown_left   { background-image: url(./tree_crown_left.png); }
+.block.tree_crown_middle { background-image: url(./tree_crown_middle.png); }
+.block.tree_crown_right  { background-image: url(./tree_crown_right.png); }
+
+.block.tree_trunk_left   { background-image: url(./tree_trunk_left.png); }
+.block.tree_trunk_middle { background-image: url(./tree_trunk_middle.png); }
+.block.tree_trunk_right  { background-image: url(./tree_trunk_right.png); }
+
+.block.tree_root_left    { background-image: url(./tree_root_left.png); }
+.block.tree_root_middle  { background-image: url(./tree_root_middle.png); }
+.block.tree_root_right   { background-image: url(./tree_root_right.png); }
+
+.block.tree_top_left_mixed     { background-image: url(./tree_top_left_mixed.png); }
+.block.tree_crown_left_mixed   { background-image: url(./tree_crown_left_mixed.png); }
+.block.tree_trunk_left_mixed   { background-image: url(./tree_trunk_left_mixed.png); }
+.block.tree_root_left_mixed    { background-image: url(./tree_root_left_mixed.png); }
+
+.block.tree_top_right_mixed    { background-image: url(./tree_top_right_mixed.png); }
+.block.tree_crown_right_mixed  { background-image: url(./tree_crown_right_mixed.png); }
+.block.tree_trunk_right_mixed  { background-image: url(./tree_trunk_right_mixed.png); }
+.block.tree_root_right_mixed   { background-image: url(./tree_root_right_mixed.png); }
+
+.block.soil         { background-image: url(./soil.png); }
+.block.soil_gravel  { background-image: url(./soil_gravel.png); }
+.block.stone_gravel { background-image: url(./rock_gravel.png); }
+.block.stone        { background-image: url(./rock.png); }
+.block.bedrock      { background-image: url(./bedrock.png); }
+.block.cave         { background-color: #000; }
+#field .block:hover { outline: 1px solid white; z-index: 10; }
+
+.morning0 .block, .morning0 #player { filter: saturate(50%) brightness(0.6) hue-rotate(-10deg); }
+.morning1 .block, .morning1 #player { filter: saturate(100%) brightness(0.8) hue-rotate(-20deg); }
+.morning2 .block, .morning2 #player { filter: saturate(200%) hue-rotate(-30deg); }
+
+.evening0 .block, .evening0 #player { filter: brightness(0.8) hue-rotate(-10deg); }
+.evening1 .block, .evening1 #player { filter: brightness(0.6) hue-rotate(-20deg); }
+.evening2 .block, .evening2 #player { filter: brightness(0.4) hue-rotate(-10deg) saturate(50%); }
+
+.night .block, .night #player { filter: brightness(0.3) saturate(30%); }