Letter Number

Your brain loves a routine. This game breaks it.

Letter Number is a fast focus game built on switching: a number and a letter sit in a yellow box, and the prompt flips between two questions — is the number even or odd? Is the letter a vowel or a consonant? The moment you settle into a rhythm, the question changes. Adapt in real time, before the timer beats you.

HOW TO PLAY
• A letter and a number appear in a yellow box
• Follow the current prompt: even/odd, or vowel/consonant
• The prompt keeps switching — stay on your toes
• Correct answers speed everything up. Endurance is the skill

WHY YOU'LL LOVE IT
• Trains mental flexibility, the rarest brain skill to train
• Two mind modes in one game: number logic + letter logic
• Fast pace that grows with you — brutally honest difficulty
• One-tap gameplay, perfect for short sharp sessions
• Clean, minimal design with zero distractions

THE SKILL BEHIND THE GAME
Psychologists call it task switching; the rest of us call it staying sharp. Constantly changing rules build cognitive flexibility, sustained attention and fast decision-making — the exact abilities that studying, coding, driving and multitasking demand.

WHO IS IT FOR?
Players with quick minds who want a real challenge: fans of brain tests, reaction games and logic puzzles. If easy games bore you in a minute, this one won't.

How long can you follow the switch? Download free and find out!

Subscriptions Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/