|Some general tips:|
You have to have Gizmo with you at the ground floor of the store, he will jump into the vent and open the locked door on the top floor. If you have him in the inventory, then this won't happen. When you are surrounded by Gremlins, Press Button so that the flash would scare them away (but be careful, the camera's battery may run out.) If you are not using the welding torch, type Close Valve so that the gas doesn't run out, but then you must have the igniter with you to light it again.
And now on to the solution:
D, GET SWORD, KILL GREMLIN, DROP SWORD, GET REMOTE, GO KITCHEN, PRESS BUTTON, PRESS BUTTON, PRESS BUTTON, PRESS BUTTON, PRESS BUTTON (chute opens), EXAMINE CHUTE (Gizmo comes out), PRESS BUTTON, PRESS BUTTON (drawer opens), DROP REMOTE, EXAMINE DRAWER, EXAMINE DRAWER, GET IGNITER, GET KNIFE, E, U, KILL GREMLIN (with the knife), GET FLASHLIGHT, D, GO DOOR, N, E, E, GO TAVERN, GO BAR, GET CAMERA, PRESS BUTTON (the gremlins flee), CUT PIPE, DROP KNIFE, GET PIPE, N, N, E, GO CINEMA, S, START PROJECTOR (gremlins leave you alone), N, N, W, W, GO STATION, GO PIT, GET TORCH, GET BOTTLE, U, N, W, S, S, OPEN VALVE, LIGHT TORCH, WELD SNOWPLOUGH (this leaves it unusable), DROP IGNITER, GET LADDER, N, N, W, GO DOOR, DROP ALL, GO POOL, GET PLUG (the pool is drained), U, GET CAMERA, GET FLASHLIGHT, GET BOTTLE, GET PIPE, GET TORCH, GET LADDER, PRESS BUTTON, E, E, E, E, E, GO CINEMA, S, START PROJECTOR, N, N, GO STORE, W, DROP LADDER, GET HACKSAW, E, S, W, W, W, N, LIGHT FLASHLIGHT, MAIL FLASHLIGHT (Stripe jumps out), CUT BOX (into small plates), GET PLATES, S, E, E, E, GO STORE, N, WELD PLATE, W, WELD PLATE, E, S, S, GO CINEMA, S, WAIT (for the little monsters!), START PROJECTOR, N, N, GO STORE, E, E, WELD PLATE, W, U, E, WELD PLATE, W, U, W, OPEN DOOR, GO DOOR, WELD PLATE, E, E, E, OPEN DOOR, GO DOOR, WELD PLATE, N, W, D, D, W, S, GO CINEMA, S, WAIT (for the gremlins), START PROJECTOR, N, N, GO STORE, W, DROP HACKSAW, GET LADDER, E, E, U, U, U, W, GO DOOR, WELD PLATE, E, E, GO TRAPDOOR, WELD PLATE, D, D, D, D, W, W, WAIT (for the gremlins), PRESS BUTTON (they disappear into the vent system, but all exits but this have been welded shut!!), WELD PLATE, PLUG DRILL, CLOSE VALVE, DROP TORCH, DROP PLATE, EXAMINE COUNTER, GET TAPE, GET DRILL, DRILL PLATE, GET HACKSAW, CUT PIPE, JOIN PIPE (with tape), INSERT PIPE, OPEN VALVE (gas is led through the pipe into the shafts), E, S, W, W, W, W, WAIT (till the shop blows up. Stripe runs past you and jumps into the pool - but WHOOPS... no water ;-), GO DOOR, DROP ALL, GO POOL, GET STRIPE, U, E (you won)