Make your way to the right. You will encounter many troops, including some who have gone prone. Look out for some of the platforms -as they will drop down, and can land you in the lava below if you don't move fast enough. You will eventually have to move up a level to progress on.

You will eventually need to jump across to the right, by using some small platforms which move up and down. You can get to a ledge which has the exit to the room on it.

In the next room, move right and you'll encounter some small drone units which fly around you and then fire single shots. You'll also find some turrets which try and lock onto you before firing. Both of these enemies are in the final version of the game, but don't appear until round 7. They are never seen in this round.

The items boxes you'll come across here sometimes contain bombs -but unlike in the final version, these bombs will not destroy the floor like they do in the final version. There is also a small problem with the lava in this prototype, as sometimes you'll see a small black square inside it. This room is very simple, just move right to find the exit.

In the next room you'll have to use small moving platforms and pipes to make you way upwards.

This room is very large, and it will take a while to get to the top of it. The drones will also make an appearance here. When you come across several moving platforms, use the pipes and hang onto them if needed. The exit is in the very top right corner of the room.

The next room has several small platforms on it, which will drop down when you land on them. But you'll need to use them to move across the room. You can also grab onto some of the pipes. The only enemies here are the turrets.

There will be several turrets grouped together that can be tricky to avoid, try a shuriken spray to take them all out at once. Once they've been dealt with, the exit isn't far away. Move through the door to find the boss.