"The UFO can only break through a block if the block below it is the same colour!"
So if the block below the UFO is red, you can break through the red block above the UFO
| Red Block | Blue Block | Green Block | Yellow Block |
| <Position 1> | <Position 2> | <Position 3> | <Position 4> |
| Red Block | Yellow Block | Blue Block | Green Block |
In the example above, the UFO can only go up if it's in <Position 1>
Hopefully, this makes sense. Let me know if you need more clarification :)