For Flood Mode, all you need to do is open your conf.ini file and paste this inside:
[floodmode]
key=c5ca7a7e8bd8fe071ae8e587baa1a250436a62d5
.
Here's how to get it the authentic way (no conf.ini editing), it also gives you the achievements
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Try to get a spawn next to wall, or in the corner (better option), you must be on normal or above
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Get all 3 slush traps, and place a beacon as soon as you step into 1 (which is why I want you to have a spawn next to a wall or corner)
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After getting all 3 slush traps, you then have to pick up the gun, NOTE: You must not pick up the gun beforehand.
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Use your super weapon to kill the 3 little creatures that are colored yellow, they spawn where you activated the slush traps
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After doing all of the above, finish the game like normal, hopefully you spawned next to a wall or in a corner.
Now enjoy Flood Mode!