Parkour

It's true that open world environments can be well-suited for parkour, as they offer a wide range of different environments and obstacles that players can navigate and overcome. However, you are correct that one potential challenge in designing a parkour game in an open world setting is ensuring that players are consistently rewarded for discovering and using different routes.
One way to encourage players to explore different routes in a parkour game could be to offer rewards for finding hidden paths or discovering secret areas. This could include items or power-ups that give the player an advantage in the game, or simply points or other in-game rewards for completing certain challenges.
Another option could be to use design elements such as level layout, environmental hazards, or enemy encounters to encourage players to use different routes. For example, a level might have areas that are more heavily guarded or challenging to navigate, which would encourage players to seek out alternative routes to avoid these hazards.Ultimately, the key to keeping players engaged and motivated in a parkour game will depend on a combination of well-designed environments, interesting challenges, and rewarding gameplay mechanics.