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San-Yon: Third Daughter? Four Tiles! is a mahjong-style board game. Engage in one-on-one matches against various characters. By winning matches, you'll unlock special cosplay outfits for each opponent. Challenge yourself to unlock every costume and complete the collection.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
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San-Yon: Third Daughter? Four Tiles! is a mahjong-style board game where you engage in one-on-one matches against three girls, each with a unique playstyle. Win a match, and you'll unlock a special cosplay outfit for your opponent.
The game is played using "Four Tiles (Yontui)", a simplified version of mahjong created specifically for this title. There’s no need to memorize complex hands or calculate scores. Even players with no prior experience in mahjong can enjoy the game through its easy-to-understand, intuitive mechanics.
Four Tiles is a two-player-only, original mahjong variant. Your goal is to form four "tiles" (sets) before your opponent does, in order to score points.
A "tile" refers to a set of three matching tiles — either three sequential numbers or three identical numbers or symbols.
The game retains the strategic depth of traditional mahjong while streamlining the rules for accessible gameplay.
By defeating each girl, you’ll unlock a unique cosplay costume for her.
Each character has her own themed outfits, which can be viewed anytime in the gallery after unlocking.
Collect them all to complete your cosplay gallery!
Regardless of the match outcome, completing a match reveals a piece of each girl's secret story.
Uncover the hidden side of each character as you progress through your matches.
