Gauntlet Legends

Get permanent anti-death
Finish the game once to get permanent anti-death.
Now, you can steal health from death.

Get new weapons
Reach the following levels to get new weapons:
Reach level 10
Reach level 50
Reach level 99

Unlock Sumner as playable character:
Reach the last stage of The Trench. Exit on the hidden door then
find all coins in the bonus stage.

Unlock Falconess as playable character:
Play on the bonus stage in the Castle Tresurary World and find
all coins.

Unlock Minotaur - as playable character:
Find all switches on the Cliff level in the Mountain Kingdom.
Go to exit, but do not enter to the exit portal. Instead, go down
until you see a trap-door marked with crossbones and a star. Go
through the door. You will warped to a secret room with lots of
coins. Pick up all coins to unlock Minotaur.

Get a familiar
Reach level 25 to receive a familiar:
Archer: Butterfly
Valkyrie: Eagle
Warrior: Dragonfly
Wizard: Dragon
Reach level 50 to receive a better familiar.