I am helping mentor with FIRST Robotics Team 830 this year. Here are the rules for the 2013 FIRST Robotics Competition. The TL;DR is that the robot basically needs to collect and shoot frisbees and climbing a really tall tower. The video below describes things very succinctly.
We need to get this done in the mater of just a few weeks. I started looking for a few inspiration ideas.
A personal favorite, the RiSE robot from the KodLab. A little too complex for our timeframe.
I really like this mechanism but I am not sure it will work on the pyramid.
Here is a slightly simpler version of the same mechanism.
This is a similar approach. Not quite applicable to our situation.
Here is a FIRST team actually meeting the challenge.
This design looks like it could be used for our applications with some modifications.
On the subject the frisbee launching this mechanism rules.
Finally, a nice primer on the physics of frisbee launching.