DF66-DDA0 Start with 2 credits
D966-DDA0 Start with 6 credits
D566-DDA0 Start with 8 credits
DB66-DDA0 Start with 10 credits
C2AE-DF65 Infinite credits
D4BB-D404 Faster timer
DDBB-D404 Stop timer--not lap timer (can still lose time by hitting hazards)

For the rest of the codes, ignore the value the block shows you. 
Your time will reflect the actual value you get.

Don't combine the next code with any other minus block/brick code.
C2BA-D7D4 Minus blocks and bricks worth 0
DDB7-0DA5 Minus 2 second block worth 0
FDB7-0DA5 Minus 2 second block worth minus 1
7DB7-0DA5 Minus 2 second block worth minus 3
0DB7-0DA5 Minus 2 second block worth minus 4
9DB7-0DA5 Minus 2 second block worth minus 5
1DB7-0DA5 Minus 2 second block worth minus 6
5DB7-0DA5 Minus 2 second block worth minus 7
6DB7-0DA5 Minus 2 second block worth minus 8
BDB7-0DA5 Minus 2 second block worth minus 9
DDB0-0F65 Minus 5 second block worth 0
FDB0-0F65 Minus 5 second block worth minus 1
4DB0-0F65 Minus 5 second block worth minus 2
7DB0-0F65 Minus 5 second block worth minus 3
0DB0-0F65 Minus 5 second block worth minus 4
1DB0-0F65 Minus 5 second block worth minus 6
5DB0-0F65 Minus 5 second block worth minus 7
6DB0-0F65 Minus 5 second block worth minus 8
BDB0-0F65 Minus 5 second block worth minus 9
DDB9-0405 Minus 3 second brick worth 0
FDB9-0405 Minus 3 second brick worth minus 1
4DB9-0405 Minus 3 second brick worth minus 2
0DB9-0405 Minus 3 second brick worth minus 4
9DB9-0405 Minus 3 second brick worth minus 5
1DB9-0405 Minus 3 second brick worth minus 6
5DB9-0405 Minus 3 second brick worth minus 7
6DB9-0405 Minus 3 second brick worth minus 8
BDB9-0405 Minus 3 second brick worth minus 9

Don't combine the next code with any other plus brick code.
C2B8-DFA4 Plus bricks worth 0
DDBB-0DA5 Plus 3 bricks worth 0
FDBB-0DA5 Plus 3 bricks worth plus 1
4DBB-0DA5 Plus 3 bricks worth plus 2
0DBB-0DA5 Plus 3 bricks worth plus 4
9DBB-0DA5 Plus 3 bricks worth plus 5
1DBB-0DA5 Plus 3 bricks worth plus 6
5DBB-0DA5 Plus 3 bricks worth plus 7
6DBB-0DA5 Plus 3 bricks worth plus 8
BDBB-0DA5 Plus 3 bricks worth plus 9
DDBC-0F65 Plus 5 bricks worth 0
FDBC-0F65 Plus 5 bricks worth plus 1
4DBC-0F65 Plus 5 bricks worth plus 2
7DBC-0F65 Plus 5 bricks worth plus 3
0DBC-0F65 Plus 5 bricks worth plus 4
1DBC-0F65 Plus 5 bricks worth plus 6
5DBC-0F65 Plus 5 bricks worth plus 7
6DBC-0F65 Plus 5 bricks worth plus 8
BDBC-0F65 Plus 5 bricks worth plus 9