If anyone else is struggling, there appears to be a typo in the instructions. You need your rate to be below something like -.12 m/s, even though it says -.2 m/s. I failed twice because of that. If your rate is blue, you're good.
Fun little simulator though. The "flat earth" setting is a nice touch too.
Fun little simulator though. The "flat earth" setting is a nice touch too.