Doom 2 Slaughterfest 3 Level 33 UV with 99.7% in 15:15 (A large triangle)
100's on kills and secrets but (131/132) for the items. This level (designed by Phml) is "Three Lines," which forms a triangle if you were to consult the automap (because a triangle has 3 sides if you learned your Geometry the right way). You relentlessly rush through, blasting enemies with the BFG (or "Big Gun" as I call it), before you have little space to move around. Otherwise, it's game over.
Slaughterfest 3 Forum: https://www.doomworld.com/forum/topic/62773-slaughterfest-3-beta_c-released-05082017/
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