It's easy to figure out how to implement different kinds of problems. What's hard is figuring out how to adapt the game to players with different backgrounds. In Math Blaster or Number Munchers, each type of problem is a separate, self-contained challenge (a level), and there's no overall plot that depends on them. In Numbers Land, each math concept is thematically associated with a region of the game world, so you wouldn't be able to leave any out without dropping parts of the plot.
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It's easy to figure out how to implement different kinds of problems. What's hard is figuring out how to adapt the game to players with different backgrounds. In Math Blaster or Number Munchers, each type of problem is a separate, self-contained challenge (a level), and there's no overall plot that depends on them. In Numbers Land, each math concept is thematically associated with a region of the game world, so you wouldn't be able to leave any out without dropping parts of the plot.