Scenarios
The player chooses a scenario, difficulty level and a character. The difficulty level is tied to what enemies and items the player encounters as they progress through the scenario. The game has five scenarios: "Wild Things", "Underbelly" "Flashback", "Desperate Times" and "End of the Road".
Each of which has an event checklist consisting of special actions that the player must perform to reach 100% completion. Upon doing so the player will unlock "Infinity Mode" in which all the player's weapons never break or run out of ammunition.
Each scenario also has "SP" items. These are invisible items hidden throughout the level, and are randomly generated on two paths. There are twenty scenario items for each scenario, and twenty items specific to each character hidden across the five scenarios. If acquired, these items unlock new costumes and the option to listen to their ad-libs. The game comes with two bonus scenarios, "Ellimination" and "Showdown", both are designed as training guides to boost gameplay.
