In order to get this achievement, the first step is to locate the Edge of the Universe. To do this, start by going to Mylantis and enlarging to Level 6. Then, hidden behind one of the three grey cube "mountains" on the upper surface of Mylantis is the only grow ring that allows you to reach Level 5 (Outer Space Level -1). From there, fly out away from Mylantis for a while (you might not be able to see it anymore) until you encounter more grow rings, and repeat until you are at Level 2. At this level, fly upwards until you reach a blue X shape, and follow it to the hole at the center of the dark brown block. This is where the fun begins.

The three trials at the edge of the universe each challenge a different aspect of the player, those being knowledge, strength, and navigation. If the steps to reach this point were followed, one should encounter a shaft guarded by a Yellow Key monster. In this shaft, there is a misleading text box suggesting that the key might be hidden within the location itself. This is not true. Now that you are aware of where the edge of the universe is, you will have to leave, find a waypoint to travel elsewhere, and come back later. To find the yellow key necessary to pass through this area, you will have to enter a seemingly completely unrelated structure: a Blackberry. If you already have a waypoint to a Blackberry set up, this makes things a lot more convenient. Go through the Blackberry normally, repeatedly shrinking until the red X room, then repeatedly shrinking through the orange and blue boxes until reaching the yellow key room. From here, do not use the pink trees to escape out of the large green room. Instead, fly to one of the far corners of the room and look for a grey pyramid with an out-only waypoint. Use the waypoint to travel back to Mylantis, then quickly (you will have to do this in two minutes or less) make your way all the way back to the edge of the universe using the grow rings, making sure that you still have the yellow key effect applied. If you make it back in time, you will be able to pass by the yellow key monster and enter the second part, the so-called "Wall Of Pain". This is the easiest part, as it only requires a few EMP blasts from a decently upgraded EMP.

Lastly, you will encounter a corridor with a waypoint, a Green Key monster, and an In-Only gate leading to an alpha cube. The instructions speak of a purple house containing the only possible waypoint to return here. Make sure to save before going through the gate to the alpha cube, as this section will take at least a few attempts for anybody. Start by entering the alpha cube with the green key active, then quickly navigate to one of the four corners at the very bottom where a room should be located containing a text box with a movie quote, a shrink orb, and a green block. The main treasure room of the alpha cube is not needed for this section. In the room with the shrink orb, shrink down and move over to the green cube, which should have a health tower on top of it. Instead of entering the health tower, shrink down to enter the quicksand grass. This might seem like a terrible idea at first, but it is the way to solve this puzzle. The next step might take a few attempts, and it is basically RNG. With the green key effect hopefully still active, shrink down repeatedly until you encounter either an area with green X blocks or a layer where yellow fruits have started to grow at the tops of the trees. If you find the green X blocks, reload your save. If you find the yellow fruits, as soon as you see them, it is time to stop shrinking. Fly around for a while until you happen to encounter a purple block. This block is the purple house described earlier. Shrink down once to enter the house normally and collect a secret trophy inside, then shrink down again and enter the house to find a secret tunnel. This secret tunnel contains a Jumbo Yellow Flower, which should be cleared as quickly as possible by going straight up through the more heavily guarded tunnel. At the center grey block is an area to go down through, leading to a chamber with 5 yellow flowers and a waypoint at the plasma upgrade info area. Finally, use the waypoint to return to the place with the green key monster, and pass by it. You will need to have a few extra seconds remaining of the key timer, as there are actually multiple green key monsters to get past. Once you have flown past them, you can grow to Layer 0 and witness the single cube containing the entire universe... and of course, you can also get the trophy. Everything here from the start of the alpha cube to getting past the green key check must be done in only 200 seconds. I wish you good luck.