Hammerwatch

Enlist the help of a partner. Play as the host and have your partner play with you until the Boss spawns. A ticking noise will be heard just before it appears. Have your friend leave the game, change their nickname in Steam, then rejoin the game. If done correctly, your partner should have all the money both of you had collected and can purchase about thirty lives. Do this three times to get ninety lives, which should be enough to kill the Boss.

Play floor 3 and hit two switches to reveal a secret area. The first is a floor switch in the southwest corner of the level. The second switch is near the center of the level, to the east of the arrow trap that fires down a long vertical corridor. The Command and Conquer Easter egg can be found in the passage that uncovered by those two switches.

Locate the portal near the southeast area of floor 10 . Walk the portal to activate a secret switch that opens the room just to the north. This room has a set of stairs that leads back to level 1. Go there and explore to earn "Midway".

Have a saved game file at the dragon Boss (last Boss in the castle). Load the saved game, collect all the money, then kill the dragon. While the castle falls, do not go down the first set of stairs out of the dragon room. Allow the timer to expire and the game will end. However, your saved game file will not get overwritten. Reload the saved game and repeat the process. Note: Leaving the dragon room will overwrite the saved game file. Note: Easier difficulties will award more coins.
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Defeat the second boss in the Temple campaign, then collect and return the pickaxe to its owner. Various rock piles around the town will now be destroyed. Move northeast from the Temple of Fear to reach a wide open area with multiple bonus items (gems, vender coins, ability pickups). Collect the red heart that appears differently than the usual +5 health upgrade to earn "Serious Pickup" and increase your maximum health by 1.