- Play as Dr. Aiden Krone
Enter the options menu, select 'Multiplayer', 'Model', then push Left to highlight Dr. Aiden Krone. Push Y, then enter 'RXYMCPENCJ' as a code to unlock the Dr. Aiden Krone skin in Multiplayer mode. -From: vitruvian_soulless

- Achievements
Do the following things to obtain the corresponding Gamerscore points:

5 Points
Get It Off Me!	Remove a stuck Clutch Grenade using Time Powers.
Look What I Can Do	Walk on water using Time Powers.
10 Points
All Fall Down	Kill 3 enemies at one time during Time Stop.
Pickpocket	Swipe 10 weapons out of enemy hands using Time Powers.
Alpha District - Casual	Finish Act 1 'Alpha District' on Casual difficulty.
The Forgotten - Casual	Finish Act 3 'The Forgotten' on Casual difficulty.
Airborne - Casual	Finish Act 5 'Airborne' on Casual difficulty.
The Strongkeep pushed - Casual	Finish Act 2 'The Strongkeep pushed' on Casual difficulty.
Munitions Plant - Casual	Finish Act 4 'Munitions Plant' on Casual difficulty.
You're It	Tag 15 enemies with Clutch Grenades.
Have It Your Way	Host and complete 10 games with custom presets.
The First of Many	Be victorious in a Ranked match.
15 Points
Munitions Plant - Skilled	Finish Act 4 'Munitions Plant' on Skilled difficulty.
Alpha District - Skilled	Finish Act 1 'Alpha District' on Skilled difficulty.
Very Gracious	Host a dedicated server for 48 hours total then quit.
Airborne - Skilled	Finish Act 5 'Airborne' on Skilled difficulty.
The Forgotten - Skilled	Finish Act 3 'The Forgotten' on Skilled difficulty.
The Strongkeep pushed - Skilled	Finish Act 2 'The Strongkeep pushed' on Skilled difficulty.
Disarmed!	Shoot 5 weapons out of enemy hands.
Beginner's Luck	Finish a level without dying on Casual difficulty.
20 Points
Are You Cheating?	Realize 30 headshots with any weapon in multiplayer games.
The Strongkeep pushed - Elite	Finish Act 2 'The Strongkeep pushed' on Elite difficulty.
MVP	Capture 25 flags in Capture the Flag.
Alpha District - Elite	Finish Act 1 'Alpha District' on Elite difficulty.
Munitions Plant - Elite	Finish Act 4 'Munitions Plant' on Elite difficulty.
The Forgotten - Elite	Finish Act 3 'The Forgotten' on Elite difficulty.
Airborne - Elite	Finish Act 5 'Airborne' on Elite difficulty.
Yoink!	Retrieve 50 flags in Capture the Flag.
Bullets Are Expensive	Kill 25 opponents with melee attacks in multiplayer games.
25 Points
Jack of All Frags	Be victorious in a Ranked match in every game mode.
Keep Away!	Be victorious in a Ranked Capture the Flag game without the other team capturing your flag.
Anytime, Anyplace	Be victorious in a Ranked match on every map.
King Me!	Be victorious in a Ranked King of Time game by at least 5 kills.
Not Even Close	Be victorious in a Ranked 1v1 game without dying once.
TimeShift Veteran	Play 100 multiplayer games.
Nuclear Be victorious inter Wonderland	Be victorious in a Ranked Meltdown Madness game by at least 30 seconds.
…Is On Your Side	Kill 50 opponents in Time Grenades or Time Fields.
That Guy Is Swift	Finish a level without dying on Skilled difficulty.
I Don't Rent, I Own	Be victorious in a Ranked Deathmatch game by at least 5 kills.
30 Points
Did I Do That?	Realize a Fury Kill.
Berserker	Go on a Reaper Spree.
Boy in the Bubble	Realize 30 kills while trapped in a Time Grenade.
35 Points
Death-Proof	Finish a level without dying on Elite difficulty.
40 Points
Alpha District Revisited-Casual	Finish Act 6 'Alpha District Revisited' on Casual difficulty.
50 Points
TimeShift Champion	Be victorious in 100 multiplayer games.
55 Points
Alpha District Revisited-Skilled	Finish Act 6 'Alpha District Revisited' on Skilled difficulty.
70 Points
Alpha District Revisited-Elite	Finish Act 6 'Alpha District Revisited' on Elite difficulty.

25 Points
You can't catch me!	Use your time shield to escape from any time field 25 times.
Ride My Rockets!	Use rocket launcher 11 times to kill opponent while he is in the air. Low gravity mode will help.
Jump of the year!	Use time powers or time fields to prevent falling damage 3 times.
DLC 1 Expert	Be victorious in ranked match on every map in DLC 1.
DLC 2 Expert	Be victorious in ranked match on every map in DLC 2.
Master Miner--Crowned!	Get 25 kills using land or laser mines.
Off. Off. Damned Clutch…	Reverse clutch grenade from yourself 3 times in multiplayer.
Flag Snag!	Throw reverse grenade in CTF mode on enemy who carries your flag
Regicide Rules!	Kill king in King of Time mode 25 times.
You won't even know how!	Throw reverse grenade when opponent is shooting you. Kill your opponent 3 times with his own shots.

- Low gravity, jump higher, and run faster
While playing in Single Player mode, select 'System Link' at the main menu, then 'Host' a game. Select any game type. Set the gravity to 'Very Low', jumping to 'Very High', and movement to 'Very Fast'. Host the game, and it will fail. Return to the main menu, then select Single Player mode. The settings from system link will continue into your single player game.

- Overcomeing the final Boss
In the battle with Dr. Krone's gigantic Sentinel, when you destroy one of his guns with the Pulse Gun, Krone will send artillery raining on your roof. In order to escape this barrage, slow time, and go into the far right corner. Face the wall and look up at Krone's Sentinel. Jump up on the platform. Keep running to the right into the corner. You will take no damage while in that corner. This works for all three barrages.