The Edge of Time

The Edge of Time is a total conversion PK3 created by FireSeraphim for the GZDoom engine. It is a remake of one of FireSeraphim's earliest mods and contains 30 levels in total. It has a score system and several mechanics related to arcade gameplay and inventory management, and also there is a split of three episodes with many custom weapons and enemies. The latest version is 1.9r1 "Contra" from 2020.

Levels
Episodes Jungle Fever, Not Egypt Again and Armies of Darkness
 * E1M1: Forest Outpost
 * E1M2: Murky Mainstay
 * E1M3: Deep in the Forest
 * E1M4: Storage and Shipping
 * E1M5: Up, Down and All Around
 * E1M6: Stormin' the Infernal Outpost
 * E1M7: Last Call
 * E1M8: True Evil Unleashed
 * E1SM1: Sanctum of the Old Ones
 * E1SM2: Deranged Demon Dwelling
 * E2M1: The Sacred Stronghold
 * E2M2: Ozymandias
 * E2M3: Canyon of Flames
 * E2M4: Village
 * E2M5: Desert Ruins
 * E2M6: Coastal City
 * E2M7: The Demon-Sphinx
 * E2M8: The Heart of Darkness
 * E2SM1: Easter Stone
 * E2SM2: An Aegean Adventure
 * E3M1: Lest Darkness Falls
 * E3M2: Siege
 * E3M3: The Confessor
 * E3M4: The Impaler
 * E3M5: The Abyss
 * E3M6: Joyeuse
 * E3M7: Corrupted Monastery
 * E3M8: The End of Roads
 * E3SM1: 2 Hectic 4 You
 * E3SM2: Eternal Aliens Switcheroo