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There are plenty of 2D platformers likeRusty Rabbitout there, and the one thing they all have in common is the presence of various special areas that are unreachable when you first find them since you need a specific ability or item to get through. These out-of-reach areas are quite common in this game, with each region having at least a couple.
Apart from areas where you can see an opening but can’t reach it, there will also be places where you’ll find a robot asking you to give it a keycube if you want to enter. There are a total of three keycube locations in the game, and here’s how you can enter each one.

Where To Find Every Keycube
Generally, when you find a locked door needing a key in Rusty Rabbit, you can find a way to open it in the same region. However, that’s not the case with keycubes. You’ll find the doors that require these as you visit certain areas, butall the keycubes can only be found in the Management Center region.
This is the last highlighted area that you’ll visit before embarking on the Space Elevator. As you go through this area, you’ll reach theEarth Revival Floor teleport point with three doors requiring keycards above it. To get these three keycards, you’ll have to go inside the two areas on the left and one on the right of this teleport, which is also where you’ll find the keycubes.
You’ll find thelever to unlock each of these roomsright outside their doors.
Here’s how you can get all three keycubes here:
Where To Use The Keycubes
Once you’ve acquired all three cubes, here are the locations you’ll need to visit to use them:
Plant Biotope Cube
To use this cube, you need to head over to the bottom right side of the Cultivation Facility area. You canfind the door just below the Disposal Storage teleport point, but you’ll need some high-tier gear to get the loot in here.
Factory Floor Cube
The door for this cube can be found in the bottomleft of the Material Storage area, to the left of the Scrap Yard Area teleport. Once you enter this, don’t break the blocks on the left as it’ll unleash lava and you’ll have to run.
Marine Biotope Cube
The final cube can be used on the top right side of the Limestone Cave area. Once you enter,you can break some blocks to fill the area with water, which will open the door at the top and let you access the main loot.