This is a 3D puzzle.
To solve the puzzle you must make every red surface of puzzle pieces looking inside of it, in other word, there must be no face red outside of it.
To look the puzzle from different angles swipe your finger on puzzle shape up, down, left or right.
To rotate pieces around use circles and to select an other piece touch triangles.
You can reset the game or pause it while playing. However, pause and reset buttons works a little bit differently. You should keep touching to those buttons for a while to let them do their jobs.
Reset button asks you if you were sure because it deletes all of game history.