Exploring a dark ancient temple with a swirling portal in American McGee's Alice

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Heroes IV Basic ModHeroes of Might and Magic IV (2002)
Heroes IV Basic Mod — a mod for Heroes 4 based on Equilibris and created by a Chinese developer. The mod adds hero specializations, new creatures, buildings, spells, artifacts, and large-scale balance changes, while also laying the groundwork for a possible full remaster and gameplay experiments.

IronTusks - Diablo3DDoom II: Hell on Earth (1994)
IronTusks - Diablo 3D is a hybrid of Heretic and Diablo on the GZDoom engine, allowing you to play through Diablo in FPS format. A town, huge dungeons, leveling, skills, a merchant, loot, alchemy, and the ability to acquire your own slave. The atmosphere, sound, and design are inspired by Diablo 1 and 2.

Global CrisisCommand & Conquer: Yuri's Revenge (2001)
Global Crisis is a mod for Yuri's Revenge inspired by Tiberian Sun and Tiberian Dawn. Using the most modern development tools, the mod tells a story about the modern world and contemporary military conflicts involving real countries and their armies in an apocalyptic world engulfed in chaos due to Tiberium and humanity's actions.

Lost in DarknessDoom II: Hell on Earth (1994)
Lost in Darkness — a hardcore survival horror mod for DOOM, where you play as an exorcist trapped in a world of darkness and anomalies. Constant resource scarcity, dangerous entities with unique tactics and emphasis on melee combat, tense sound design and atmosphere.

Decay: SingularityHalf-Life (1998)
Decay: Singularity is a fan mod for Half-Life that transforms the Decay mode from the PS2-exclusive expansion into a fully functional single-player campaign for PC. Cooperative requirements have been removed, save functionality, difficulty selection, and the bonus mission Xen Attacks have been added.

They Hunger Trilogy Half-Life (1998)
They Hunger - a cult horror mod for Half-Life where the player finds themselves in a rural area overrun by a zombie apocalypse. It features three episodes with a dark atmosphere, new enemies, weapons, and sound design.

HLFX: Lost in Black MesaHalf-Life (1998)
HLFX: Lost in Black Mesa is a short single-player mod for Half-Life based on the updated HLFX engine, featuring enhanced graphical effects and classic gameplay. The mod tells the story of Alex Jones, a young scientist who finds himself in an HEV suit on the day of the disaster.