If you made a game that was about ww2 and you played a leader and made choices that might work but then you not learning the real history because your making your own choices. For math I would think that if you played a game that required a lot of math like an Engineering game that could work. I know you didn't ask this in you question but for learning a language I have a lot of friends that change the language of a game to the language there learning so if there playing a game like Minecraft the could learn when there playing.
Planting vegetation over the mined area is the best solution that provide the largest benefits to society and the environment with low cost as compared to other solutions for reclamation such as refilling the land with soil and filled water to make a lake. Vegetation over mined area clean the environment as well as provides timber in few years which is used for making different products. So vegetation is the best solution for reclamation of mined area.
