I won't say much about this very simplistic appearing puzzle. 3 pieces into 1 tray should be easy for you. Two color version available. If these sell out, more will be available very soon.
Size: 3.75" x 3.75" x .25" ( 9.5cm x 9.5cm x .6cm)
Fit the 3 pieces into the tray
Designer: Goh Pit Khiam