I built this free SAT tower-defense game. Answer questions for ink, then build pencil, eraser, highlighter, and compass towers to protect your answer sheet. Play in your browser without an account.
Margin Guard (grindsat.com) was submitted to SlowDen by Unknown developer. SlowDen did not make this game - it is published here from the developer's own submission, added on 2026-10-03. It runs in the browser with no download, no install and no sign-up.