0
you unlock a new bonus movie
There are no crystals in Crash 1.
They appear in Crash 2 and on.
If you're thinking of gems, it's when you go through a whole level on one life.
In the rest of the games, you get the gem by breaking all the crates
no it will not spam your messages it happend to Me once
playfree 1000 gems
playwild 1000 gems
danceparty 1000 gems
foodfight 1000 gems
NewYearsJam 1000 gems
discovery 1000 gems
potion 1000 gems
playsmart 1000 gems
moviebytes-1,000 gems
peskyphantoms-phantom cage
petty soul gems, lesser soul gems, greater soul gems, grand soul gems