Break boards, rewind mistakes, master your combos.
The modern Yu-Gi-Oh! sandbox — every card, full engine, zero setup. Build and test decks, break real meta boards, and duel online or against a real AI.
A chess-style move timeline — step back and forward through a duel and the entire game state rebuilds deterministically: deck order, once-per-turn flags, chains and all. Practise a combo, undo, and try the line again instantly.
Go second against pre-built modern boss boards — Lunalight, Branded, Swordsoul, Mitsurugi — with a defensive AI that fires the board's disruptions on your turn. Learn how to actually break through, not just goldfish.
See the chain build as numbered links, then watch it resolve top-down in real time — spent links dim and strike out, the active link pulses. Finally understand what's happening in a long chain.
Not a passive dummy — a heuristic AI that summons, sets, tributes, targets, and responds with triggers, at a readable one-action-at-a-time pace.
Everything a tournament grinder needs to go from idea to sleeved list — in one screen.