Player 1: Place player 2's first symbol in all six slots. Press the button.
Player 2: Place player 1's first symbol in the first slot and fill the rest with a symbol that player 1 DOESN'T have. Press the button to check if it's in the right place. If not, swap the first rune (the one player 1 does have) to the next place and press to check until you have one match. Remove all runes except player 1's first.
Player 1: Remove all runes except the one in the same place where player 2 left your first symbol. Fill the rest with player 2's second symbol and press the button.
Player 2: Place player 1's second symbol in the first open slot and fill the rest with wrong symbols again. Swap and check until you find the second match. Remember not to move the first match. Once you find the right spot, remove the filler.
Player 1: Remove all runes except the two matches. Fill with player 2's third symbol and press the button.
Repeat.