Completion bonus
Finish the game to access the survival mode and level select options.

Alternate ending sequence
Obtain all the treasures and secret swords while playing to get a different ending sequence.

Cheat mode
Go into Areliano's house. It has three empty bedrooms and a guest room to where you are taken. You have to open the doors into these rooms from the corridor in a certain order to enable the cheat mode. Opening the doors from the room side will not work you have to be standing on the corridor side. There are three doors in the corridor, with the third door being nearest Rhama's room. Now ipen the first door three times, the second door six times, and the third door nine times. If you happen to make a mistake, you need to start again. If done right, the last Boss' sword will appear on your character's back and you will have 99 pistols in your inventory. Also, when you finish the game, all ending credit bonuses will be available. Note: The pistols will go when you go to the next level. By collecting all of an item after the code is used has the opposite effect and will cancel that bonus in the ending sequence.