Descent Maximum

To get these cheats to work, enter the following codes in the Keys Section:
Effect
Code
All Keys
STXTC TX TXTSX MIK
Cloak On/Off
XTC SCTSX TXTC RED
Full Shields
TXCS SXC TSXCS BUG
Invulnerability On/Off
TSTCS TSX TSCT DCD
Mega Power Boost
STCS TSX SCTSX
1 - MEGA-WOW (WEAPONS/ENERGY/SHIELDS) - STOS TSX SOTSX - ACE
2 - ALL KEYS - STXTO TX TXTSX - MIK
3 - INVULNERABILITY ON/OFF - TXTOX TSX TXOT - DCD
4 - CLOAK ON/OFF - XTO SOTSX TXTO - RED
5 - FULL SHIELDS - TXOS SXO TSXOS - BUG
6 - GO WINGNUT ON/OFF - TSOTX STOS TXO - 4AD
7 - TURBO - TSOX SXO STOXX - SVT
8 - EXTRA LIFE - TXSO TX SXO XTO - +1 UP
9 - ROBOTS MOVE FAST, FIRE SLOW - TXS STO SXO STO - JAVA
10 - COLORS - TXO TSOX TXTOX - LSD
11 - ACID - STOS TSX TX TOX - ACID
12 - MEGA-WOWIE-ZOWIE (MEGA WOW/KEYS/LEVELS) - TSOXT STX TSXO - $40
13 - ALL ACCESSORIES - STOXX TSXO SOX - TOY
14 - HELLO MINNIE! - XOXOXOXOXOXO - XO

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 Destrega

Max Charge Dash
Charge two or three levels, and cancel with a dash. Dashes can deflect lower level attacks.
Secret Characters
Finish one-player mode with any character, and then in the Character Select, press Start on that character to get the secret one.

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 Destruction Derby

Secret Track
Choose "Wreckin' Racing", then "Championship" and enter the name "REFLECT!". Now go to the main menu again and choose "Wreckin' Racing" again. This time, choose "Practice". At the track selection screen, you should see the new track.
Invincibility
Follow the steps above, but enter "!DAMAGE!" as your name instead.
Select Number of Racers
Follow the steps for 'Secret Track', but enter the name "NPLAYERS" instead.
Reflect!
 will give you access to the 'Ruined Monastery' track.

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 Destruction Derby 2

All Tracks
First, select any type of race. Then, enter Championship Mode and enter the following password as the name:
MACSrPOO
Then, go back to the beginning, and enter Practice mode.
Animated Credits
Enter Championship mode and enter CREDITZ! as your name.