Playfield coloring?

[Rabbit 2600]

I'm intrigued by games such as Demolition Herby where you can color the playfield and I had an idea that might work as a Bomberman clone but I have no experience with using the playfield in such a manner. The premise would be that the player pushes the fire button and that makes missile0 appear next to the player. This I can do, no problem. But, how do I go about that after 2 seconds the playfield pixel where missile0 is lights up for about a second and then dissapearing, and how do I setup collision for the pixel if it's lighted up?