I wanted to have the timer set to something short, but after a switch is pressed, a barrier would disappear, and the timer would finally start. I could have it just start like a normal stage, but I wanted to set up a little area for players to get prepared. The default switch with sprite 197 is plenty for the barrier, but I don't see a way of manipulating the timer.

As I am very inexperienced with ASM, I would like to know how this is done.