Great stuff... but on this test, instructions are a little unclear. It took me a while to understand that the 8 possible positions of the 'door' were the 'image' I was back-matching, and not the pattern of markings on the tunnel sides.<p>Also, as with other tests, the lack of a clear end (or even break) point is distracting, and makes it hard to compare runs, or even cleanly end a run at a standard length.<p>Not that whacked_new asked, but my overall estimation of cognitivefun: wow, you're generating a lot of games... but the overall comprehensibility of the site lags a bit. It's almost too much to absorb: where do I start? where do I stand? where do I go next? I suggest spending a little more time (or enlisting some help) with web design/copywriting/info-architecture.