Finish Heretic

Three classes, hub levels you walk back through, and puzzle switches instead of coloured keys.

True 3D, brown corridors, a Nine Inch Nails soundtrack and the birth of deathmatch.

The BFG, the imps and the shareware episode that ran on every office PC in 1993.

Escape Castle Wolfenstein floor by floor; id's first-person shooter before Doom.

The Strogg war on Stroggos; the first Quake with a story and coloured lighting.

The super shotgun and the Icon of Sin; thirty more levels of 1994.

Occult SS experiments and the castle to escape again, this time on the Quake III engine.

Hipnotic add three episodes, a Mjolnir that arcs lightning and a proximity mine launcher; the first mission pack.