Here is one Curve Data puzzle.
Chaos
Here is one Curve Data puzzle.
Puzzle
Here is one Curve Data puzzle.
Frolic
Here is one Curve Data puzzle.
Beetle
Here is one Curve Data puzzle.
Serpent
Here is one Curve Data puzzle.
Masyu Inflatable
Here is one innocent-looking 5 by 5 Masyu puzzle:
Inflate it to twice its original size, though, and it turns into a full-blown 10 by 10 Semi-Liar Masyu:
Cipher Shikaku Twins
Masyu Twins
Star Battle Pentominous
Here is one Star Battle Pentominous puzzle.