Once you've collected all 48 powerstones from levels 1–8, a sewer pipe in the main hub will open up. Walking through said pipe transports Kiwi to a simple level with the centrepiece being a monument with 5 buttons at the top. To input codes, attack the runes in the order shown by a code.

Over the course of the guide, I'll give number orders for each codes, along with images of the codes as found in-level.
For reference, I've numbered each symbol from left to right as such:

Please note that character codes are purely visual, unless stated otherwise! Kiwi's hitbox always stays the same, meaning gameplay is unaffected.

Most codes will override each other. To deactivate all active codes, simply input a combination that doesn't have an effect.

When inputted, the code for Area 1 turns the Kiwi into the dog pilot helping Kiwi off the island.


In numbers, the code is:
2, 4, 3, 5, 1
This code is found within the hollowed-out tree:

When inputted, the code for Area 2 makes Kiwi twice as big. Despite the visual difference, Kiwi's hitbox is unaffected.


In numbers, the code is:
4, 1, 2, 5, 3
This code is found on the port side of the overgrown ship:

When inputted, the code for Area 3 turns Kiwi into one of the robot enemies found throughout the game.


In numbers, the code is:
1, 4, 2, 3, 5
This code is found behind a wall as you approach the final slope to the boiler:

A fun one! When inputted, the code for Area 4 applies moon gravity to Kiwi's movement!


In numbers, the code is:
3, 5, 1, 2, 4
This code is found on the right side of the main tower, near the top between two pipes:

When inputted, the code for Area 5 turns Kiwi into one of the state switches found within the level.


In numbers, the code is:
5, 4, 1, 3, 2
This code is found at the two paths to open a wall, behind the left entrance wall to right-side room where water raises platforms to jump on:

When inputted, the code for Area 6 spawns a temporary pipe that leads to a bonus level. The area is a miniaturised version of the map from the original Kiwi 64 released on itch.io, and presents the game's 50th powercell atop the mountain's peak.


In numbers, the code is:
1, 3, 2, 5, 4
This area's code is a bit harder to gather, with one rune located on each coffin. The full code is made by entering the runes top to bottom. I've compiled them here into one image for the sake of simplicity.

When inputted, the code for Area 7 turns Kiwi into a playable powercell.


In numbers, the code is:
3, 1, 4, 5, 2
This code is found on the backside of the rock formation with a chest atop it:

Another fun one! When inputted, the code for Area 8 puts the camera into first-person mode!
Note that despite the visual change, Kiwi still attacks in the last direction you moved, not the direction the camera is facing.
You can also stack this code with other effects!


In numbers, the code is:
2, 1, 3, 5, 4
This code is found on a rock wall close by the red key:

Thanks for reading this silly little guide! It's my first time doing something like this, so I'm happy how it turned out.

For one last tidbit, did you know you crouch with the [ctrl] key? If you jump out of a crouch, you'll jump noticeably higher then you would normally.

That's all, have fun with the codes!