Sneak through his house, rig his stuff, and don't get caught.
You're the Scout, with no weapons, inside the Neighbour's house, built and furnished in Team Fortress 2. It's all six episodes of the first season of Neighbours from Hell in first person: take his things out of the fridge, the health kit and the ammo box, then rig his stove, his armchair, his TV, his beer, his toilet, his mailbox, his birthday candles, his whipped cream, his aftershave, his piano, his bath and the Sniper Rifle he peeps through while he's in the other room. Hide in a locker and watch. If he sees you, you freeze in fright; if he catches you, the episode starts over. Win an episode and the next one begins.
From Team Fortress 2: the house, every object in it (a few come from the Half-Life 2 base that ships with TF2), and the Scout.
From Neighbours from Hell: the Neighbour, his voice and routine, the pranks and their scores, the items, the HUD and the music, read from your own copy the first time you press Play.
Single player. Needs Team Fortress 2 and Neighbours from Hell (Steam: Neighbours from Hell Compilation). If Neighbours from Hell isn't installed, the mashup says so in the game.
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Credits: Neighbours from Hell by JoWooD Vienna (HandyGames / THQ Nordic). Team Fortress 2 by Valve. Built with AI assistance (Claude). Not affiliated with or endorsed by Valve, THQ Nordic or HandyGames.