Strategic cube placement using portal gun in Portal 2007 puzzle room

Mental Omega is arguably the best mod for Yuri's Revenge and one of the most ambitious fan projects overall. It not only completely reimagines the original game but also significantly expands it, transforming it into an almost full-fledged sequel with a new storyline, campaigns, factions, and a massive amount of content.

Half-Life: Residual Point is an ambitious mod for the original game created by Korean developers. It represents a reworking of the original Half-Life events with the addition of new elements and story expansion.

A mod that randomizes almost everything in Half-Life, making each playthrough unique. Instead of the familiar crowbar, you might get a Hivehand, and a harmless headcrab could become a deadly enemy. Anything is possible - no matter how many times you return, you'll never predict what's around the corner.

Chain Reaction is a mod for Half-Life that adds a new story campaign telling the story of a Black Mesa complex hydroelectric power plant employee working in sector G.

Half-Life: Invasion is a Half-Life mod that continues the story immediately after the events of Half-Life. The player finds themselves in the secret Black Mesa laboratory, saved by a space probe, and faces an invasion of well-prepared soldiers. You will explore new areas of the laboratory, gradually uncovering government schemes and secrets.