In Nitrome's platformer Colour Blind, you play one half of a pair of sentient, walking eyeballs. Ain't even kidding. When your other half gets abducted by a grungy cloud with a serious case of stink-eye, you set out to rescue her across a grey world filled with danger. Lucky for you, a little colour can change the way you see reality! Use the [WASD] or [arrow] keys to move, and [spacebar] to jump. Jump through paintbrushes to allow yourself to see with whatever colour they contain, also enabling you to interact with objects of that colour like platforms, crates, tokens, and more. Take a dousing from water and you'll wash away all the colours you've got, but since some things that may block your way or hazards like spikes and enemies are also tied to certain colours, washing the slate clean isn't always a bad thing. Just avoid taking damage, since you'll be sent back to the last checkpoint you touched!
As cute as it looks, Colour Blind can be seriously challenging at times. While there are some puzzle aspects, in most cases it's your reflexes that are being tested, with precise platforming and timing being a factor. The difficulty ramps up noticeably after the first batch of levels, and the one-hit KO can bring you to your knees. It's not necessarily something you'd expect given the game's bouncy soundtrack and cutesy-poo style, and if I'd had any tables in my immediate vicinity while failing over and over at certain points, I would have flipped them most soundly indeed.
Of course, being unexpectedly difficult doesn't make a game bad, and Colour Blind definitely is not bad. Demanding, sure, but hardly bad. Levels are deviously designed, and the game's colour swapping mechanic gets used in some interesting ways that will test your skill. It does seem like the placement of checkpoints is a bit uneven, with some stages throwing them at your feet and others miserly hoarding them, which means having to redo an entire sequence of meticulously timed areas you barely skirted through by the skin of your teeth because you were off by a split second in hopping over a single spike could lead to some ragequits. But if you're up for a challenge, and a good looking one at that, give Colour Blind a try. Just don't be surprised if it has you seeing red.