SuperTux

You can use the space bar to make your hero Tux jump and arrow keys to move him around, right in your own browser.

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manifest.json

{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "name": "SuperTux",
  "description": "You can use the space bar to make your hero Tux jump and arrow keys to move him around, right in your own browser.",
  "version": "0.0.0.2",
  "manifest_version": 2,
  "icons": {
    "128": "icon_128.png"
  },
  "app": {
    "launch": {
      "web_url": "http://supertux.datacivilization.com"
    },
    "minimum_chrome_version": "22"
  },
  "permissions": [
    "unlimitedStorage"
  ]
}