Undertale is a story-rich indie RPG built in GameMaker Studio that blends turn-based combat, dialogue choices, and bullet-hell dodging segments. Players control a child who has fallen into an underground world of monsters, making decisions that branch into Pacifist, Neutral, or Genocide routes with completely different endings and character arcs. Most players complete the game multiple times to experience every path, focusing on precise timing during enemy attack patterns that fill the screen with projectiles. At 1080p the game is essentially running its native pixel-art resolution inside a letterboxed window, so graphical demands stay extremely low. What matters is rock-solid frame pacing and near-zero input delay so your keyboard or controller inputs register instantly when you need to dodge or select dialogue options. The research shows that unpatched older versions could exhibit minor input lag during complex boss fights, but modern hardware and community patches largely remove this. Common pain points for new players include building far more PC than necessary because they assume the retro style still needs high-end components, or pairing a weak CPU with background applications that introduce stutter exactly when bullet patterns become dense. Before choosing a PC for Undertale at 1080p, understand that the title rewards responsiveness far more than raw polygon-pushing power. Visual upgrades like higher resolutions or ray tracing provide no benefit to the fixed pixel aesthetic, while even light mods that add texture packs only modestly increase load. The sensible system therefore prioritizes a modern CPU that stays responsive under Windows multitasking, enough fast RAM to keep everything in memory, and a GPU that can output a perfectly smooth signal at 1080p without ever approaching its limits.