Mac (10000 programs)

Pros: Questions span entire history of the US. Hint function provides help when needed. Carefully researched questions. Three different difficulty levels.

Cons: Number of questions is relatively small. Free version does not include 'Hard' tier. Input method may not appeal to some. No competitive head-to-head options.

Pros: Simple but effective puzzles. Large difficulty variety. Interesting progression system. Easy to pick up and play.

Cons: Smaller puzzles. Small puzzle packs. Point gating is sometimes heavy. 32- and 64-bit version differences.