READ THE CASE · 20 TRIALS
Classify each letter before the timer runs out.
Complete 20 trials. Wrong answers and timeouts count, then the game continues.
READY?
Press ↑ or U for uppercase. Press ↓ or L for lowercase.
Keyboard: ↑ / U for uppercase · ↓ / L for lowercase. Touch: tap a labeled button.
HOW TO PLAY
Start the game and watch the large letter in the center.
Choose UPPERCASE for a capital letter or LOWERCASE for a small letter.
Finish all 20 standard trials, or protect your endless streak against a shrinking timer.
LETTER CASE REACTION GAME
Every trial asks you to recognize a familiar letter form and map it to one of two responses. The standard set balances ten uppercase and ten lowercase letters.
This is a recreational browser game, not a clinical assessment. Display, device, input method, focus, and practice can affect your score.
READ YOUR RESULT
Accuracy includes every answer and timeout. Average and best reaction times use correct answers only.
For a fair personal comparison, replay the same mode on the same device with the same input method.
QUESTIONS
Press Up Arrow or U for an uppercase letter. On touch screens, tap the UPPERCASE button.
Press Down Arrow or L for a lowercase letter. On touch screens, tap the LOWERCASE button.
Standard mode records the mistake and moves on. In endless mode, one wrong answer or timeout ends the run.
Yes. Every standard game contains exactly ten uppercase and ten lowercase trials, using a varied selection of letters.