CheatCodes.com has all the official Seaman Dreamcast cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Saturday May 25, 2013 for Seaman are shown below.
First, start tickling a seaman then when he is laughing and said stop it move the hand to another seaman and they will both be happy.
Press X + R and press Left or Right when over a rock to move it.
Place the game disc in an audio CD player and play track two to hear a hidden message.
Select a Seaman and move the Analog-stick in circles around its head.
After naming your Seaman the first time, repeatedly ask "Do you love me?". Eventually, you will be able to change your Seaman's name.
It is good to talk to your Seaman frequently. You need to teach them how to talk. Try to talk as clear as possible. Hold the A and talk into the microphone. The Gillman stage is the stage when it will first start to talk. Use these words when talking to your Seaman: Hi, Hello, Hey, No, Yes, Seaman, Fish, Fun, Play, (and more). Experiment, but do not call it bad name or it will become unhappy. Also, remember to feed it at least once a day.
While playing the game, you will see a shell at the bottom of the tank. Keep tapping the shell until it starts to eat your newborn Seaman (Mushroomer's). After they are eaten, tap the shell more until the squid completely comes out. It will squirm, and eventually after tapping it enough, it will die and the baby Seaman will appear and will be in the next stage (Gillman). Hold A while talking into the microphone to speak to your Seaman.
Set the Dreamcast's system date ahead several days for faster evolution. However, the tank will also not be maintained for that amount of time.
Note: This trick requires two VMUs. Start and save a new game using a second VMU. Connect this VMU to a VMU that has an ongoing game. Transfer the food from the new game to the ongoing game. Repeat this as needed for unlimited food.
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