Frankly, crystal rewards were too generous) I enjoyed easy crystals a lot!!! ...and made use of them! My proposal is 1) to make all three mission rewards "non-crystal", but to still reward with crystals accomplishing of all three missions. 2) to make missions incompatible with each other, i.e. 2 missions not to be accomplished in one go, each separately; For example, "earn experience in battles" + "earn experience in CTF mode" + "collect *** boxes" - is actually one same play. Can be for example, "earn experience in CTF mode playing for REDs" + "earn experience in CTF mode playing for BLUEs"+ "collect *** boxes in DM mode"; And exclude just "earn experience in battles" for it can still be combined with any mission. 3) make crystal reward not as a fixed amount, but as a coefficient to earned crystals during missions. Well, I think, it is best to start with small multiplier like ~ x1.1 / x1.2 and to invent periodically special occasions to increase it slightly. Tankers, don't kill me for that!)