[modeless]

You may be interested in http://www.zachtronics.com/tis-100/. It's essentially a code golf game with many different metrics to optimize including number of instructions.

[spydum]

wow, thanks! great line: "It’s the assembly language programming game you never asked for!"

[nsajko]

It's DRM-ed, sadly.

[acc00]

Not anymore: http://www.gog.com/game/tis100