Unlock the next set of 9 puzzles by solving any 5 puzzles under a specific theme:
THEME - HOW TO UNLOCK ASTRAL - Solve 5 puzzles in SOMNI. ATOM - Solve 5 puzzles in FALL. FALL - Solve 5 puzzles in FUJI. FOREST - Solve 5 puzzles in RIVER. FUJI - Solve 5 puzzles in FOREST. GLOOM - Solve 5 puzzles in MOTHER. MOTHER - Solve 5 puzzles in ATOM. OMEGA - Solve every puzzle in every previously unlocked theme in under the "average" number of moves. RIVER - Solve 5 puzzles in SKY. SHINE - Solve 5 puzzles in GLOOM. SOMNI - Solve 5 puzzles in UNIVERSE. UNIVERSE - Solve 5 puzzles in SHINE.
Unlock different ending sequences by performing the corresponding tasks. Note: credits can be viewed any time from the title screen.
CREDITS - HOW TO UNLOCK CREDITS - Solve at least 5 puzzles in every theme from SKY through UNIVERSE. CREDITS 2 - Solve at least 5 puzzles in the themes SOMNI and ASTRAL. CREDITS 3 - Solve every puzzle in every theme in under the "average" number of moves.
Choose a theme and access any of the puzzles under it with no moving cores. After 1 minute, the music will change. After 5 minutes, all images on the screen other than the background animation will disappear. After 10 minutes, the music will change again to a relaxing theme (which is probably what the game's description in the DSiWare shop is referring to). Note that not all themes follow this pattern, and the music for a couple themes will change again after 20 minutes of inactivity.
After you complete specific tasks within a single theme's puzzles, a small image will appear (not necessarily related to the actual theme) on the top DS screen when accessing a level that has already been solved, or when solving a new puzzle in that theme for the first time.
IMAGE - HOW TO UNLOCK Bonus Image 1 - Solve any 5 puzzles in a single theme. Bonus Image 2 - Solve all 9 puzzles in a single theme in under the "average" number of moves.