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. 2021 Mar 24;9(1):e20916. doi: 10.2196/20916

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©Yangfan Xu, Meiqinzi Tong, Wai-Kit Ming, Yangyang Lin, Wangxiang Mai, Weixin Huang, Zhuoming Chen. Originally published in JMIR Serious Games (http://games.jmir.org), 24.03.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Serious Games, is properly cited. The complete bibliographic information, a link to the original publication on http://games.jmir.org, as well as this copyright and license information must be included.

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(A) The 3 difficulty levels for the left and right feet and the unique lifting foot height recognition interface. (B) The system-specific adjustment of the curriculum difficulty’s design according to patient conditions and default settings. (C) The patient raises their right foot, and when the hip and knee flexion reach the requirements of this level, the footprints above the gopher will turn from white to red. (D) When patients step down with the right foot, it shows an image of the gopher fainting.