User blog comment:Hoverbored1234/Tips and Tricks for Event Bosses/@comment-14070061-20130814154202

It is a valid system. It appears, during the latest event at least, that Mobage is onto this tactic and is reducing the rewards on bosses. Previously, all raid bosses would yield energon cube for first attack, battle cube for finisher... Now (outside of first tier boss) they are offering medals for first attack. So, check the boss rewards before engaging.

Another thing to watch out for is that when you do Level Up, it recharges your battle cubes, so to maximize this you need to plan to be able to scan for bosses and use your existing cubes BEFORE hitting the Level Up else you are wasting cubes (i.e. if you lvl up with 2 cubes remaining, you will only gain 1 cube vs. lvl up without any cubes you gain 3)

Dont lvl up if you only need to wait 4 minutes for a cube recharge, just wait the time out, use the cube, then lvl up for the recharge...