Daily challenges vary from day to day, but are basicaly divided in three parts:
*Depending on the difficulty you must add puzzle pieces in a certain amount of moves to "unlock" them.
Easy and medium start more at the edges of a puzzle, while the harder ones start with different pieces with spaces between them.
You must "catch" the bug in a space while you block off the space. Easy and medium have less pieces, while the harder difficulties have more.
*Jig Saw Jammer
You get a certain amount of time to finish several puzzles and score a certain amount of points. Clicking in pieces at a fast rate gives you "chains" which is like the combo in most other games. You get certain puzzle shapes like zig-zag shapes, square shapes and regular puzzles.
Lockbreaker is the easiest as you check for the edges which lets you finish the quickest. Just finish any challenge and you get this!