Since I am a developer I have always created fun games for my kids to play and learn. Almost every single time they just go with the game mechanics instead of the actual learning concept. The only game which worked was a roblox game[1] I created for fun. And that too, its just a basic obby. Nothing fancy. But I told my kid, he can play Roblox for 30 minutes if he can finish this obby for 5 numbers. So, in a way, had to force him. But within a week, he was able to memorize the multiplication tables :)

[1]https://www.roblox.com/games/10489578087/Multiplication-Game