How to play
Find the hidden equation: A ○ B ○ C = 4
Enter digits (1–9) and operators (+, -, ×) to build an equation that equals the target. Standard math precedence applies (× before +/−).
After each valid guess, every position gets feedback:
■ Green = correct symbol, correct position
■ Yellow = correct symbol, wrong position (same type)
■ Dark = symbol not used
Only guesses that evaluate to 4 are accepted. You have 6 attempts.
Keyboard: type 1–9, +, −, *, Backspace, Enter.