Baldi's Basics Plus is the full expanded version of Mystman12's viral indie horror hit. Where the original was a single compact school, Plus introduces procedurally generated multi-floor buildings, meaning no two runs are the same. You still need to collect notebooks and escape Baldi's ruler-slapping wrath, but you'll also encounter a larger cast of NPCs — each with their own behavior and ways of complicating your route — and a deeper item pool to find and manage.
The biggest change is replayability: procedural generation means you can't memorize a fixed school layout. New game modes include an endless challenge and a field trip mode that changes the gameplay entirely. The surreal atmosphere is dialed up with more environmental weirdness and new character animations that make Baldi feel simultaneously funnier and more unsettling than before.
Move with WASD, interact with E, run with Left Shift, and look with the mouse. Collect notebooks to progress through floors — the exit only opens once you've grabbed enough. Manage your stamina carefully and always keep track of which hallways Baldi is likely to be patrolling.