not only is this "ecard" f-cking ridiculous, but when the character goes off the screen you can't bring it back - presumably because you forgot to extend the floor past the screen... 1/5 but only because you can't give 0.
i struggled for a long time trying to complete the 1st epic boss level. in the end it took the right combination of skills so that i could just wipe out the first 10 waves without spending any mana (only upgrading the mana pool)
Ultimately, i paid no attention to the colour of the gems at all (and still don't) providing they're pure.
 "Mushroom Revolution"){kind=icon}
 "Death Dice Overdose"){kind=icon}
 "Perfect Balance"){kind=icon}
 "GemCraft"){kind=icon}
 "Space Pips"){kind=icon}
 "Warbears Adventures : An A.R. X-Mas"){kind=icon}
 "Achievement Unlocked"){kind=icon}
 "Fishing Girl"){kind=icon}
 "Winter's Greetings!"){kind=icon}
 "Ice Panic"){kind=icon}
 "Pyromasters"){kind=icon}
 "SeppuKuties"){kind=icon}
 "Black'n'White 2"){kind=icon}
 ":the game:"){kind=icon}
 "IncrediBots"){kind=icon}