Unlockable difficulties:To unlock Chaos difficulty, beat the game on Hard. To unlock Hell difficulty, beat the game on Chaos.Extend duration of elemental ammunition:To extend the duration of your elemental ammunition for any Gunrod, simply switch to a different Gunrod. When you need the elemental ammunition Gunrod, simply switch back.Stage select:Complete the game to unlock stage select.Concept missions (downloadable content missions):Complete the game to unlock the “Concept Missions” option and access to all of the missions that you have downloaded from Xbox Live.Easy points:To easily gain points, frist complete Stage 1. Choose your upgrades, continue, then quit the game at the start of Stage 2. Press Start, load your saved data, and select “New Game” at any difficulty setting. When the new game starts you will have the upgrades previously available at the start of Stage 2 in your previous session. Repeat this process as many times as desired. Note: This do this same process between any 2 stages, so if you get bored of playing through one stage, you don