Connect Four with one twist. Before the match starts, both players place a hidden block anywhere on the board simultaneously. Neither of you knows where the other placed until you collide.
Both players secretly place one blocked cell simultaneously. Revealed when the match starts.
Take turns dropping pieces into columns. 8 seconds per move. Board fills from the bottom.
First to connect four wins the pot. Board fills with no winner — overflow column unlocks. Still tied — threat score decides. True tie — full refund.