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Wait, so the current challenge is to mosaic a 225px-wide image into 10px chunks, without changing the overall size?

Not even the power of Ruby can make 225 % 10 == 0

No, but you can still use 10x10 chunks where possible and use chunks as close to 10x10 as possible for the rest.

Sure, but that wasn't the specced challenge. If you can bend the rules, what becomes of the game? [edit: moved reply to nest]