The Dink Network

Yep. I've used it in Day of the Carcass when Dink got trapped underground. You can see it in action in the teaser at 0:24.

Here's the bit of code I used to change the tiles.

map_tile(25, 5020);
map_tile(26, 5021);
map_tile(37, 5032);
map_tile(38, 5033);
map_tile(49, 5020);
map_tile(50, 5021);
map_tile(61, 5032);
map_tile(62, 5033);
draw_hard_map();
draw_background();