Goblin Mines

Don’t touch the blue flame.  It’s deadly.

The pink switch on the floor near the flame isn’t deadly, so go and stand on it.

When you’ve done that, different coloured monsters will start to appear and walk along the path towards the flame.  Only let a monster walk into the flame if it matches the flame’s colour.  Shoot any non-matching monsters.

If the flame burns up three matching monsters in a row, then it will be extinguished (along with any remaining monsters).

Go and stand where the flame used to be.  Then walk towards the door at the bottom of the picture.  As you walk along the path, it lights up behind you.