In high school I made a little game with a similar feel. It showed a tower of stones, same for everyone online. To add a stone you needed to hold mouse for abou

In high school I made a little game with a similar feel. It showed a tower of stones, same for everyone online. To add a stone you needed to hold mouse for about 7 seconds. There was also a massive red button to collapse the tower. The record was about 350 stones placed.