John Romero's Daikatana

Dopefish was one of the characters that appeared in Commander Keen, Episode IV back in 1991.

John Romero likes to make an appearance of Dopefish in his games (Dopefish is also in Quake).

The Dopefish is hidden in four places in Daikatana, one location per episode. Here's the list of places:

E1: In the Sewer System, part 2, there's a secret area that contains the Shotcycler-6 and a bunch of Sludge Minions. You will see one of the four corner lights in the room. Shoot each one until they descend into the floor. When all four have been shot, you'll hear a strange sound and at the bottom of the pool in the center of the room, a grating will slide open and reveal the first Dopefish's lair.

E2: In the Acropolis, part 1, the first major structure that you enter will have a huge water fountain in it. Jump into the water in the fountain, find the open spot and swim into it. You have to break the wall under here to gain access to the second Dopefish's lair.

E3: In the Plague Village, part 1, near the very end of the level is a final bridge that you must cross. Under this bridge is a boarded-up well. Break off the wood and swim down into the well, moving around the protruding rocks the whole way until you find the third Dopefish's lair.

E4: In the Tower of Crime, part 2, there's an elevator shaft that has a little secret under the water at the bottom. You need to climb the ladder in the shaft and go all the way down to the floor where your feet will be barely covered in water and you cannot duck under it to see where the secret is located... you must simply shoot at the ground until it breaks out from under you. When you go down into the new opening, you'll find a Vitality powerup. To the right of the Vitality is a wall that is breakable and behind that wall is the fourth and final Dopefish's lair.

In each Dopefish's lair there's a Manaskull invulnerability artifact -- it will allow you to either look at the Dopefish for a while, or allow you to try to completely destroy the Dopefish, which takes a LOT or work to do.

In the Tower of Crime

Dopefish's Lair