A 20 minute bomb timer
This is a 20-minute bomb-style countdown, pre-set and ready to go — a serious deadline. Hit Light the Fuse and the big digital readout starts falling from 20:00. The stage pulses red, the warning symbols flash, and the ticks speed up as the fuse burns down. The last ten seconds shake the screen, and at zero you get a flash-of-light BOOM.
What fits in 20 minutes
Twenty minutes is a short presentation, a group project sprint, or a long escape-room run. It is also close to the classic focus block, with an explosion instead of a chime.
It suits presentations, group projects and extended escape-room runs. If you need a different fuse, every other length is one tap away below, or type your own into the box.
How a 20 minute fuse feels
Twenty minutes is long enough that the explosion is genuinely startling — people forget it is coming, which is either the point or a reason to mute it.
Before you start
The ⛶ button fills the screen, which is where the effect actually lands, and 🔊 silences the ticks and the explosion if the room is already loud. Reset defuses it early. There is a fuller rundown of the stages, the sounds and the classroom uses on the main bomb timer page.
