The 10th annual IEEE 3DUI Contest focuses on the development of 3D User Interfaces (3DUIs) using passive haptic feedback in Mixed Reality Environments. Material properties of real objects are enhanced with virtual behaviors while used for interaction in a mixed reality scenario. The contest was open to anyone interested in 3DUIs, from researchers to students, enthusiasts, and professionals. The purpose of the contest is to stimulate innovative and creative solutions to challenging 3DUI problems.