In its latest Steam weekend dealio, Valve has launched an offer that’s hard to resist, especially if you somehow have yet to delve into the Half-Life universe. This weekend only, Steam customers can save a whopping 66% on anything and everything Half-Life. That means the entire HL saga can be had for around $20. Like we said, incredibly hard to resist, right?

Additionally, the company is offering its enormous “Valve Complete Pack” at 10% the usual purchase price. For $89.99, it includes Counter-Strike, Counter-Strike: Condition Zero, Counter-Strike: Source, Day of Defeat, Day of Defeat: Source, Deathmatch Classic, Half-Life, Half-Life 2, Half-Life 2: Deathmatch, Half-Life 2: Episode One, Half-Life 2: Episode Two, Half-Life 2: Lost Coast, Half-Life Deathmatch: Source, Half-Life: Blue Shift, Half-Life: Opposing Force, Half-Life: Source, Left 4 Dead, Portal, Ricochet, Team Fortress 2, and Team Fortress Classic.

Whew, quite a list there. I’d totally jump on that if I didn’t already own more than half the games listed.

Read more: Valve Announces Steam Cloud, Store Saved Games And Settings Online, Left 4 Dead Survival Pack, Source SDK Hits This Spring, EA Slices Up The Orange Box, Valve Acquires Left 4 Dead Developer, Orange Box Just $9.99 This Weekend Only