Mountain Mogul

Mountain Mogul is a free ski-resort tycoon you play entirely in the browser. You start with an untouched, forested mountain and turn it into a resort: draw your own trails, plan chairlifts, gondolas and lodges as blueprints, paint learning areas, run a ski school, set prices, and try not to go broke before the first big storm. Every guest is simulated — they park, rent skis, pick runs that match their ability, wait in lift lines, grab lunch, and head home when their legs give out — and you can compare your resort on leaderboards or visit other players' mountains.

The game is updated almost every day: the jam thread shows the author shipping version 2.33.2 in October 2026 with fixes for a double-charged grooming cost, snowmaking on closed nights, and a tutorial-card overlap, each verified by re-running the same test script. The mountain view shows live numbers — skiers on each trail, lift lines, snow base, cash — so every build decision reads off the slope itself.

How it was made is listed on the game's AI Browser Game Jam 5 page under "AI Tools Used": "Claude Code (Opus 5.5)". The game is free, runs on computer and phone, and is also entered in the jam under the same author.