Hello there, folks. We're going to help you get the "Level 12" Achievement in Lab Crisis for completing the twelfth Level.
This is impossible to miss, as you need to complete Levels to advance through the game.
On Level 12, which looks like this:
One left/right and one up/down monster here, but the solution is simple. Walk all the way right so you're below the orange monster, then go a block down, and a block left. This blocks the green monster with the orange one, and you're free to grab the Scientists and exit.
If you want specific inputs to solve Level 12(R = Right, L = Left, U = Up, D = Down)
RRRR RRRR DLDD RDRU RDRU LLLL UUUL LUUU
If you prefer a Video Walkthrough, watch at 9:55 to see me getting this Achievement. The video below will get you all 5000G in Lab Crisis in 20 minutes.