LOOPY was the subject of a recent CLE K-12 discussion tread. I had not heard of LOOPY before then, so I decided to play around with it a bit, v1.0, that is. Congratulation on having made it fun and very easy to draw and play qualitative simulations as causal loop diagrams. Still, just now, most immediately I find wanting to pause a simulation and check things out. So, how about adding a Pause/Resume function to complement to the current Play and Reset functions.