Lenny Loosejocks in Space/Pluto

Pluto is, or at least was when the game was released, the last planet in the solar system.

To begin, walk to the right and flip the lever. Turns out that the lever controls an elevator into the Pluton base. The elevator ends at a small artificial waterfall. It's just water so simply walk thru it.

The middle section of the base is focused around two elevators, one on the left side and one on the right side. The left elevator always goes between the lower and middle area, while the right elevator either goes between the surface and the middle area, or between the lower and middle area. A lever in the middle area controls which way the right elevator goes.

The bomb is in the rightmost part of the lower area. You need to take the right elevator down to see the path to it.

There are two obstacles, a door and a large shark tank. The door is easily opened by the lever in the middle of the lower area. The shark tank can be frozen by turning off the central heating. The switch for the heating is on the surface, to the left of the right elevator.

Disarming The Bomb
The Pluto bomb is the easiest bomb to defuse. It's a 4 by 4 lights out puzzle. Simply press one square each on the four sides of the grid, avoiding the corners. This will solve the puzzle in just four clicks.

Once the bomb is disarmed, turn the power back on to unfreeze the waterfall and take the same elevator you entered the base to get back to the ship.