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Any Easter(ish) DOS games?
(retrolemmy.com)
A place to discuss anything DOS related. From DOSBox to actual retro hardware and FPGA emulation. From old games and software to new running on DOS. We also allow source ports of games originally on DOS.
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For some reason when you say colorful dos games, my mind immediately went to some of the Commander Keen games. Doom also has a Commander Keen as an Easter egg in it. And Quake has a dopefish in it. So any of those if Easter egg isn't too much of a stretch.