Rygar - The Legendary Adventure - Platform: Playstation 2

In-game reset
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Hold Start + Select during game play.

Easy mode
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Die three times under the normal difficulty setting to unlock easy mode.

Hard mode
---------
Successfully complete the game (including Necromandio Cave) under the
normal difficulty setting to unlock hard mode.

Legendary mode
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Successfully complete the game (including Necromandio Cave) under the hard
difficulty setting to unlock hard mode.

Guitarmor
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Successfully complete the game (including level 30 of Necromandio Cave)
under the normal difficulty setting.

Hamburgarmor
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Successfully complete the game (including level 30 of Necromandio Cave)
under the hard difficulty setting with an "A" rank.

Pizzarmor
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Successfully complete the game (including Necromandio Cave) under the easy
or higher difficulty setting to unlock armor shaped like a pizza.

Rollerarmor
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Successfully complete the game (including Necromandio Cave) under the hard
difficulty setting.

Sushiarmor
----------
Successfully complete the game (including level 30 of Necromandio Cave)
under the legendary difficulty setting with an "A" rank.

Udonarmor
---------
Successfully complete the game (including Necromandio Cave) under the
legendary difficulty setting.

One World mode
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Successfully complete the game (including Necromandio Cave) under the easy
or higher difficulty setting.

Replay bonus
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Successfully complete the game and save it. Start a new game under any
difficulty setting to begin with the same attack and defense statistics 
and Mystic Stones from your previous attempt.

Defeating Icarus
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When you face Icarus the second time (on the floating island), note the
color of the lightning around him. If it is red, use any weapon besides 
the Hades. If it is yellow, use any weapon besides the Haven. If it is 
blue, use any weapon other than the Sea. If you use the same color as him, 
you will not do any damage.