Online Duel is the JoJo's Bizarre Adventure game you play against another person, live. Two tables share one room: Bids, an auction where you build the strongest squad of Stand users, Hamon masters and vampires with a limited purse, and Tic Tac Toe, a 3x3 character grid where every square asks for someone who fits two rules at once.

Both tables are ranked on their own ladders, from Bronze through Silver, Gold, Platinum, Diamond and Elite up to Master. The five best Master players of each ladder hold a LEGEND seat, and seasons close on fixed dates: finish a season in a LEGEND seat and you keep its title on your name for good. You can play as a guest without an account, but only signed-in players climb.

Pick a table, then Find Match to be paired with a random rival, or create a private room and share its four-letter code with a friend. If nobody is free after a short wait, a rival is seated for you so you are never left in the queue. Private rooms pay XP and coins but never move the ladder.

Bids: eight characters go under the hammer one at a time, and each player starts with a $20 purse. On your turn you either raise the bid or withdraw; withdrawing hands the lot to whoever holds the bid, and a lot nobody bids on goes unsold. When all eight are sold, the higher total Fighting Spirit wins, and a tie goes to whoever has more money left. Each turn has a 20-second clock.

Tic Tac Toe: three rules run down the side and three across the top, taken from JoJo Bingo: a Part, an affiliation, a fighting style, a power band and so on. On your turn, name a character who fits both rules of a free square. A right answer claims it; a wrong one costs you the turn. A character can only be used once per board, and each turn has 30 seconds. Three in a row wins. If the board ends without a line, the player who placed more characters takes it when one of you left a turn unanswered, otherwise whoever used less total time.

Leaving the table loses the match: a seat that stops answering for three turns, or closes the page mid-match, forfeits it to the player who stayed.

In Bids, the lots come in four power bands, two from each, so after a few lots you know what is still to come. Save money for the top band, Giorno, Kars, DIO, Jotaro and the like, and let your rival overpay for the middle. Every dollar left over breaks a tie.

In Tic Tac Toe, take the centre square when you can answer it: it sits on four lines. Spend your obvious answers on tight squares first, because a character used on an easy square is gone for the hard one next to it.

Rematches against the same rival pay a little less each time, so a quick rematch is for fun, and the ladder rewards fresh matches.