Break the code.
Four colours, hidden. Black for right and in place, white for right colour.
A black mark means one peg is the right colour in the right place. A white mark means one is the right colour somewhere else. Each mark belongs to one peg — two of the same colour in your guess against one in the code earns one mark, not two.
Hide a code.
Then watch how few goes it takes.
Tap a place, then a colour.
Go
1
Left
10
Still possible
1296
Tap a place, then a colour.
0
goes
Best ever
—
Played
0
Broken
0