It uses the canvas element to do most of the rendering and should work in both FF2, FF3, Opera(9.27 and beta) and Safari 3.1.1. There are a few glitches in Safari in the kart sprites, but other than that it should be playable. Also, if you’re using WebKit nightly builds, make sure you’re using the latest, as some of the recent ones had some canvas problems. I haven’t even considered getting IE support, sorry.
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