CHEATS:

At the start, go right and jump over the entrance gates of Levels 1 and 2.
Then go as far right as possible and up onto the roof. From here, go left
and you'll be in the first secret level.

For two extra lives: In the level behind the first gate, jump up on the
last question mark platform. You'll reach a niche - walk a bit left
(or right?) and you'll get two extra lives.

Item Cheats (collect on the castle roof):
Spell CHEAT by collecting: Trip (Tap), Apple, Earth, Hammer, Cake
The screen will flash. You now have a shield for 10 minutes.
WARNING: You can still die! Quickly finish the first room - all doors
are now open and you can jump into any level.

Spell POWER by collecting: Penguin, Oil, Wine, Earth, Racquet

Spell LIVES by collecting: Lips, Ice cream, Violin, Earth, Snowman
This grants infinite lives!

CHEAT CODE:
Type "THANKS WAYNE" (y=z) during the title screen. Keys:

F      - Robocod gets wings
P      - Robocod gets a plane
B      - Robocod gets a bathtub
C      - Robocod gets a car
X      - Go to exit
S      - Save position
G      - Load saved position
K      - Robocod dies
RETURN - Invincibility ON/OFF
F6     - 50 Hz screen
F7     - 60 Hz screen
F9-F10 - Screen effects
M      - Map selection:

01 Level 1-1          19 Bonus Level 6    37 Level 5-1
02 Level 1-2          20 Level 4-1        38 Bonus Level 10
03 Level 1-3          21 Level 4-2        39 Level 8
04 Bonus Level 1      22 Bonus Level 7    40 Bonus Level 11
05 Level 6-1          23 Bonus Level 8    41 Level 9-1
06 Bonus Level 2      24 Level 4-3        42 Bonus Level 12
07 Bonus Level 3      25 Level 7-1        43 Bonus Level 13
08 Level 6-2          26 Level 7-2        44 Bonus Level 14
09 Level 6-3          27 Level 7-3        45 Bonus Level 15
10 Level 1&2 Boss     28 Level 7-4        46 Bonus Level 16
11 Level 5&6 Boss     29 Level 7-5        47 Bonus Level 17
12 Level 7&8 Boss     30 Level 5-1        48 Hard Level!
13 Level 3-1          31 Level 5-2        49 Level 9-2
14 Bonus Level 4      32 Level 5-3        50 End Animation
15 Level 3-2          33 Level 5-4
16 Bonus Level 5      34 Level 5-5
17 Level 3-3          35 Level 5-6
18 Level 3-4          36 Bonus Level 9