The Marble Draw Interface and Game are an experimental implementati­on that seeks to provide a collaborative challenge to a team of two users. Inspired by a ball-in-the-maze puzzle, the interface uses two knobs to control an on-screen cursor via the tilt of a plane. The cursor’s movement is translated into a line drawing in the game, where users are challenged to trace a simple shape as precisely as possible.

The game offers two diffe­rent drawing methods: The Cursor Placement Method, which allows users to place the cursor before connecting the line, and the Continuous Method, which draws a line wherever the cursor moves.

A small-scale user study (N=4) explored the interface’s usability and overall impression. Participants found the Cursor Placement Method easier to control and more confidence-inspiring, while the Continuous Method was described as more fun, complex, and challenging and was ultimately preferred. The interface overall was described as creative, engaging, and collaborative.