Double Impact

Double Impact is a episode replacement PWAD for The Ultimate Doom by Matt Cibulas (RottKing) and Ralph Vickers (Ralphis). It is a winner of 2011's 18th Annual Cacowards, requires a limit-removing port to play. In its original PWAD form, it replaces all nine levels of Episode 1. It has also been included with Freedoom: Phase 1, as part of the fourth chapter of the game.

PWAD line-up

 * E1M1: Maintenance Area
 * E1M2: Central Computing
 * E1M3: Research Complex
 * E1M4: Hydroponic Facility
 * E1M5: Engineering Station
 * E1M6: Command Center
 * E1M7: Waste Treatment
 * E1M8: Launch Bay
 * E1M9: Operations

Freedoom line-up

 * C4M1: Maintenance Area
 * C4M2: Research Complex
 * C4M3: Central Computing
 * C4M4: Hydroponic Facility
 * C4M5: Engineering Station
 * C4M6: Command Center
 * C4M7: Waste Treatment
 * C4M8: Launch Bay
 * C4M9: Operations

The Freedoom versions of the levels are edited versions to keep them under Vanilla limits, for these ones which exceed static limits. M2 and M3 are swapped to facilitate the secret exit as well.