フルスタック！

フルスタック！ is a free deck-building roguelite for the browser, in Japanese, set in the everyday life of a software engineer. A six-question aptitude survey decides your starting deck, which comes with two tech-debt cards left by your predecessor. A run goes through a training project, a maintenance project, new development and a big release, each with three battles and an event. Cards cost focus, which refills each turn, and come from six fields (search, brute force, defence, efficiency, AI and connections): “Google it” does double damage to common bugs, “Ask ChatGPT” is strong but sometimes lies with confidence. Bugs behave like real ones: one that will not reproduce vanishes every other turn until you add logging, spec changes heal, production-only bugs pierce your guard, and closed tickets reopen. Each battle has an estimate in turns; finish within it and you leave on time and recover, go over and overtime wears your mental health down. Copy-pasting slips “fix it later” debt into your deck, which you can spend to borrow focus or pay back by refactoring. Knowledge earned goes into eight career paths, and every run ends with a career diagnosis, win or lose; a run that ends in burnout is also written up as a post-mortem in the form of an incident report. Runs take 10–15 minutes; the developer balanced it by running tens of thousands of simulated runs. It is the one game on the developer's VANNAN GAMES site set outside the shared town. Per the developer, kawaiy, the code is almost all written by Claude Code; illustrations are generated with ChatGPT and music with Suno. The AI card field and the ChatGPT card are part of the theme; the game calls no AI services. Free in desktop and phone browsers.