Reverse 1999 Musae’s Arcade is the Version 3.9 party minigame event, opening 7 November 2026 at 10:00 UTC and ending 17 December at 09:59 UTC. Complete main story 1ST-16 Heaven Apostles to join. Play arcade games for Duel Cards, use those cards in Duel Time to earn Marvelous Marbles, then spend the Marbles on costume coupons or materials.
The big prize is ONiON’s Front Page Exclusive collaboration garment. You can play alone, join a random match or set up a room with friends, so the event doesn’t require a premade group. Here’s how each menu fits together, which rewards are actually free through play and what to finish before the deadline.
Reverse 1999 Musae’s Arcade dates and unlock requirement
The arcade begins on Saturday 7 November at 05:00 (UTC-5), or 10:00 GMT in the UK, 11:00 CET and 19:00 JST. It closes on 17 December at 04:59 (UTC-5), or 09:59 GMT. You must first finish 1ST-16 Heaven Apostles, the same main-story gate as several other Version 3.9 events.
After unlocking the event, choose how to enter: create your own party room and invite friends, join random players or select solo play. The publisher doesn’t specify that solo participation reduces rewards or require you to win a particular number of group matches. Use the current event rules to choose the play format you prefer.
How to get Duel Cards in Reverse 1999 Musae’s Arcade
Start with the arcade minigames. Playing them awards Duel Cards, which are then used in Duel Time battles. This is a two-step progression system: cards are for entering the Duel Time reward loop, not the main currency you spend directly on an outfit. Check the available games and their displayed rewards when the event begins.
Bluepoch’s early announcement doesn’t list every minigame, its scoring targets or the precise Duel Card yield of a win. The event isn’t live until 7 November, so a universal best farming mode would be premature. Focus on getting cards from the activities you can complete reliably, then use the cards in Duel Time.
Reverse 1999 Musae’s Arcade Marvelous Marbles and the costume machine
Duel Time provides Marvelous Marbles. Take them to the Costume Vending Machine to obtain exchange coupons for cosmetic pieces, and equip the pieces in Musae’s Dressing Room. You can also use Marbles at Musae’s Store for growth materials. These are two distinct uses of the same currency.
The featured rewards include ONiON’s Front Page Exclusive outfit, Sonorous Knell and growth materials. Bluepoch doesn’t give a final coupon cost or a set number of matches needed for the garment in its initial summary. Before using all your Marbles on materials, inspect the Costume Vending Machine so you know what the outfit route requires.
Is Reverse 1999 Musae’s Arcade ONiON outfit a login reward?
No. Front Page Exclusive belongs to the Arcade reward system rather than the fourteen-Unilog sign-in campaign. It is also separate from ONiON’s Broadcast to the World Anecdote, which starts on 13 November and awards a five-star Psychube and Greed. Playing one does not automatically award the other’s prizes.
The Summer-Gold Sea main story uses Confetti Strip, while the Arcade uses Duel Cards and Marvelous Marbles. Keep those currencies separate when deciding which events to farm. The main story stages finish on 14 December, three days before the Arcade closes.
What to complete before Reverse 1999 Musae’s Arcade ends
The event closes at 09:59 GMT on 17 December. Before that date, play the minigames, spend earned Duel Cards in Duel Time and claim any Marbles or costume coupons you need. Check your Dressing Room after using the vending machine so you know which outfit pieces have actually been obtained.
The easiest way to avoid disappointment is to check the costume exchange requirements in the live event before buying growth materials. Version 3.9 includes plenty of separate shops and banners, and neither a paid garment purchase nor an unrelated main-story completion replaces the Arcade’s confirmed Duel Card-to-Marble progression.
Official source: Bluepoch’s Version 3.9 Musae’s Arcade announcement.
