Arcade mode becomes unlocked when you have successfully completed the game.


Unlockables
The following options in the game are unlocked by collecting the corresponding number of Crystal Shards during gameplay.

Unlock Puzzles 1-20::
Collect 20 Crystal Shards.

Unlock Puzzles 21-40:
Collect 40 Crystal Shards.

Unlock Tiny Spyro:
Collect 43 Crystal Shards.

Unlock Disco Palette:
Collect 45 Crystal Shards.

Unlock Permanent Zoom Mode:
Collect 48 Crystal Shards.

Unlock Maximum Powers:
Collect 51 Crystal Shards.

Unlock Inifinite Breath:
Collect 54 Crystal Shards.

Unlock Invincibility:
Collect 57 Crystal Shards.

Unlock Cynder Character Skin:
Collect 60 Crystal Shards.