Thirty-One
Thirty-One Summary
Thirty-One is a mobile iOS app in Games by Koichi Iwasaki. Released in Dec 2025 (3 months ago). Store metadata: updated Dec 30, 2025.
Store info: Last updated on App Store on Dec 30, 2025 .
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App Description
"Simple yet deep! The classic card game ”31 (Thirty-One)” is now available as an app! Experience thrilling tactics as you try to get your hand total as close to 31 as possible. The rules are simple, but winning requires real strategy. From beginners to pros, this is the definitive card game for everyone.
◆ Face off against unique rivals! Challenge nine distinct characters, each with their own playstyle:
Newbie: A beginner whose unpredictable moves might surprise you.
Aggressor: A bold player who loves to ”Knock” early.
Tactician: A strategist who calculates maximum efficiency.
Stoic: A steady player who prioritizes not losing above all else.
CPU Master: The ultimate AI that calculates every probability.
◆ Customize the rules your way! Fine-tune the game settings to match your favorite playstyle:
Should Aces (A) count as 11 points?
Should Three-of-a-Kind count as 30.5 points?
Will you allow ”Blitz” or ”Sweep”?
Use your best strategy to defeat the ultimate CPU Master!"