Take the sai and use the highest difficulty setting. Start the first level. As soon the first enemies spawn, run further into the room and ignore the enemies that initially run towards you. This will force more enemies to spawn. Run to the back of the large lobby room to fight enemies that spawned earlier. There will still be a steady supply of enemies spawning. While building combos, go towards the section that connects the lobby you are in, to the other big room. When your enemies start declining, there will be another two in on the way that help you reach a 300x-combo.
Use the oven in Deadpool's kitchen.
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This can be done during a second playthrough with all the upgrades. Use the Plasma gun counter to almost instantly kill every enemy. Use the sub machine gun against ranged enemies. For the final Boss battle, use the flashbang grenade and hammer combination. Note: This must be timed correctly to avoid getting grabbed.
Interact with the following objects in Deadpool's apartment.
Enter the audio options and set "Dialog Volume" to "Mute".