Ah, I forgot that there were people who could potentially interpret what was on the board :)

All of those four blue items on the right are actually separate, but you're right in guessing that they're synthesis rewards. The general idea of the CT2 synth rewards is that they're not consumable - you get the little synth item 'ingredients' that you find around the levels and can manufacture your own of some of them from other items, but the eventual goal items that you get are there permanently as trophies and might give you other abilities as side effects (for example, synthesizing the Quartz Flask gives you the Heal spell rather than acting as a one-use item). As far as I remember, the ideas were:

- A compass that would add a fourth arrow to the ones in the hub to aid your navigation (though admittedly not a very useful level)

Some sort of artefact that I hadn't decided on in order to give you a time-slowing spell (or more accurately the frame rate - I've tested an idea for this, it wouldn't speed you up in relation to most things but it would improve your effective reaction times on missions like the gems one that the testing forum had such trouble with)

- A stopwatch (though this would be appropriate as the above, wouldn't it?) which would unlock a sort of time attack mode in the levels and would only take another six million hours of work to implement

- And like you, I have absolutely no idea what I envisioned by the word "combometer". Possibly something similar to the above that counted your best/highest-scoring jumps.

It's quite remarkable how my computer fails every time I think about working on it, though.