Which is better for a 4-year-old?

Osmo. Gravity Maze is rated 8+ and its puzzles assume planning skills a 4-year-old usually does not have yet. Osmo is designed for ages 3 to 5.

Which is better for a 9-year-old?

Gravity Maze. Osmo's Little Genius content targets preschoolers, so a 9-year-old will outgrow it fast. Gravity Maze's 60 challenges run up to expert level.

Is Osmo worth the extra money?

Only if you have a compatible iPad and a child in the 3-5 range. At $39.36 versus $19.97, you are paying for the app and age fit, not more content.

Does Gravity Maze need a tablet or phone?

No. It is a physical marble run with challenge cards, so it works with no screen, battery or app.

Which lasts longer as the child grows?

Gravity Maze. Its difficulty ramps from beginner to expert, while Osmo Little Genius is capped at preschool skills.

Will Osmo work on my tablet?

Only on an iPad running iPadOS 10 or later. It does not support Android tablets or Amazon Fire devices.

ThinkFun Gravity Maze Marble Run Brain Game vs Osmo Little Genius Starter Kit

These are not really competing for the same child. Gravity Maze is a solo logic puzzle for ages 8 and up, and it costs $19.97 at Amazon as of November 5, 2026. The Osmo Little Genius Starter Kit is a screen-based starter set for ages 3 to 5 that needs an iPad, and it costs $39.36 at Shopverse as of November 5, 2026. Buy Gravity Maze for an older kid who likes building and solving alone; buy Osmo only if you already have a compatible iPad and a preschooler.

Today the ThinkFun Gravity Maze Marble Run Brain Game costs $19.39 less at its best price.

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