If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
What could possibly go wrong while standing around unstable buildings during a live demolition? Lots of death, that’s what. Carefully demolish each building to ensure maximum carnage of hapless bystanders.
Kill each person on each level by placing your bombs strategically on each structure, then pressing the detonation button in the lower-right corner.