Yes, in the Tangram game there are four levels: Easy, Medium, Hard, and Challenge. Each level corresponds to a color in the game: easy = yellow, medium = orange, hard = red, and challenge = blue.
Junior mode is made up of about a dozen puzzles, some of which use only a couple of puzzle pieces. The game gives the player many visual and audio cues to assist in completing the puzzles. Junior mode puzzles do not use all of the pieces.
Treasure mode features a large map that the player can use to navigate his/her way throughout. Treasure mode includes levels Easy, Medium, Hard, Harder. Every puzzle in Treasure mode uses all of the pieces.
When Classic mode is enabled, the puzzles appear as a giant grid of puzzles, with none of the treasures or trees or anything like that on it.