Enter a string to generate the hash of. This will return the MD5, SHA1, SHA256, and SHA512 hashes.
Magento Community Edition does not have a convenient maintenance mode and the "maintenance.flag" file method is too heavy-handed. You may want to put the store into maintenance mode but still give yourself access. Here is a quick and dirty way to do it using PHP.
If the user has scrolled the page that your canvas game is on, or used the browser zoom feature, it can mess up the accurate calculation of the mouse position. An easy solution is to use the getBoundingClientRect method of the canvas object. This returns a rectangle object that gives you the current offset of the canvas relative to the page.