@Ohbye: The game is still complete (and excellent) without the premium content. Granted, the additional options that premium grants are beneficial, and endless in particular will help you level up faster...but that's why its premium. Plus its only 50 Kreds, and given the high quality of the GemCraft series, $5 is hardly a lot of money for the play value. Hell, if you really wanted you could scrounge up 50 Kreds from free offers. But yes, people will whine, as they are wont to do.
There also seems to be a bug in elimination mode after you hit question #50. It only provides one answer for you to select (which is the correct answer). After question 54 the game stopped loading questions and the tuner knob just kept spinning with static on the screen. An entertaining game, but gets a 3/5 from me for now
I've got some glitch where a second song is looped over top the songs playing in the game, and additionally the track/video playing isn't any of the available answers.
It would also be nice to have the question number somewhere on the screen.
 "Midas' Gold Plus"){kind=icon}
 "GemCraft Labyrinth"){kind=icon}
 "Space is Key"){kind=icon}
 "Ninja Hamsters vs Robots"){kind=icon}
 "Music Match"){kind=icon}
 "Castle Wars 2"){kind=icon}