That sort of craftsmanship is what I admire in game designers. I know it's trivial, but I like when you can put up a map covering an entire game where all the pieces, even if technically separate, end up fitting together perfectly without cheating.
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"With the first link, the chain is forged. The first speech censored, the first thought forbidden, the first freedom denied, chains us all irrevocably." [...] The first time any man's freedom is trodden on, we're all damaged. - Captain Jean-Luc Picard
Current projects:
(Gen), Sonic The Hedgehog (Gen), Sonic CD (Sega CD), Mega Man V (GB), Mega Man Zero (GBA), Battletoads (NES), Bucky O'Hare (NES)