Robot challenges you to guess its number before it guesses yours.
You and Robot make a four-digit number with no digit duplication. Then you both score the opponent's guess and try to guess the opponent's number in turns.
It's a two-digit number with the first digit representing a total of guessed digits and the second one representing a number of the guessed digits in the right positions.
0...9 - fill your inputs
ARROW LEFT/RIGHT - activate another place in your input
ENTER - submit your input
SPACE - start/reset the game
B - toggle the background animation
ESC - toggle this explanation