@macerator420,
Excellent Job! You are the first person we are aware of who has completed Circuit Snap post release! Some of the puzzles are pretty challenging, so this is no small feat.
To respond to your puzzle requests:
Tri-State Buffers were on the roadmap, but we pulled them. They utilize high-impedance outputs. The simulator we designed behind Circuit Snap assumes all components utilize low-impedance outputs. Adding support for high-impedance outputs is a decent amount of work so the 2 types of outputs could be sorted through properly in simulation. Perhaps sometime in the future, but it isn't on the list for the short term.
In regard to sequential components such as latches, flip flops, etc., yes, we really wanted to add these components. However, in order to release, we decided not to include sequential components and only explore combinational components in the puzzles. Adding sequentially driven solutions would require comparing previous states in addition to the current state, which is a non-trivial amount of work. Although I agree it would add a lot of cool new puzzles.
We had not thought about adding IMPLY & NIMPLY puzzles. This looks doable without too much work. We will take a look at including a couple of puzzles to cover IMPLY / NIMPLY gates in the next update. Good idea.
-Brett