Head to head
Gravity Maze vs GraviTrax
Both are marble toys rated 8+, and both are listed on Ravensburger's US site. One asks a child to solve a puzzle; the other asks them to build a machine.
By Sawyer V. · Published
The short answer
Choose on solving versus building. ThinkFun publishes Gravity Maze as 60 single-player challenges, each solved by placing towers so a marble reaches the target. Ravensburger publishes the GraviTrax Starter Set as 122 pieces across 18 element types, with nine included track designs and an expansion range. Both are rated 8+.
Block & Beaker earns a commission when you buy through our links, at no cost to you. It never changes a ranking, and we say so plainly when the right answer is the cheaper set, or nothing at all. Full disclosure · How we pick.
At a glance
The picks, ranked
Tap any row to jump to the full reasoning. Prices come live from Amazon where we have them and read “check price” where we don’t — never a number we cannot stand behind today.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Better for building GraviTrax Starter Set 122 pieces across 18 construction element types, including a vortex, a launch pad and a magnetic cannon. | Eight and up, for a child who wants to design | |
| 2 | Better as a puzzle ThinkFun Gravity Maze 60 challenges from beginner to expert, with a marble that proves the solution. | Eight and up, for a child who likes one right answer | |
| 3 | The in-between Q-BA-MAZE 2.0 Big Box 72 interlocking cubes with three exit types, so a structure branches. | Six and up, for branching structures | |
| — | Not at eight Marble Genius Marble Run Super Set A 150-piece marble run published for ages 4-8 — its range ends where both of these begin. | Four to eight |
4 picks, including 1 we tell you to skip. Ages shown are the manufacturer’s own rating, not ours.
Side by side
The arithmetic
Published specifications
| Stated age | Both 8+ |
|---|---|
| What it is | Gravity Maze: a single-player logic puzzle | GraviTrax: a track construction system |
| In the box | Gravity Maze: grid, 9 towers, 1 target, 60 cards | GraviTrax: 122 pieces, 18 element types |
| Marbles | Gravity Maze 3 | GraviTrax 6 |
| Guided content | Gravity Maze: 60 challenges | GraviTrax: 9 track designs |
| After the guided content | Gravity Maze: finished | GraviTrax: open construction and an expansion range |
| Batteries | Gravity Maze: none |
Solve or build
Gravity Maze gives a question. A challenge card shows some towers already placed and lists the ones the child must add. There is one arrangement that works, and the marble says whether it has been found.
GraviTrax gives a set of parts. The nine included designs show what is possible, and then the question becomes the child’s own: can I make the marble do that?
Both are genuinely about gravity and both reward thinking several steps ahead. A child who loves a right answer usually loves the first; a child who loves to tinker usually loves the second.
Why the numbers differ in kind
ThinkFun’s 60 is a finite number with a real end — a determined child will finish it. Ravensburger’s 122 pieces never finish, because pieces are reused in new layouts. That is why Gravity Maze is an excellent second present and GraviTrax can be a main one.
Room, and growth
Gravity Maze lives on one grid and packs back into its box. GraviTrax is built on base plates and grows with every expansion Ravensburger publishes, which is its strength and its cost: a system that grows needs somewhere to live.
Owning both
These complement each other rather than overlap. One trains the puzzle-solving habit of predicting a marble’s path; the other turns that habit into construction. Our view, not either maker’s, is that a child who enjoys one often enjoys the other.
Worth knowing before you buy
Both are rated 8+, and both contain marbles — a choking hazard for younger siblings. Count marbles back into the box after play; Gravity Maze publishes three and GraviTrax six, so a missing one is noticed quickly.
So which one
A child who wants one right answer: Gravity Maze.
A child who wants to design machines: the GraviTrax Starter Set.
Six or seven: Q-BA-MAZE 2.0, rated from 6.
Say the unwelcome thing
Do not buy GraviTrax expansions before the starter is outgrown
The nine included designs are the test of whether the child wants more. A starter set that has not yet been built through does not need an expansion; it needs another rainy afternoon.
Where to go next
The Gravity Maze review and the GraviTrax review go deeper. Marble runs, compared covers the construction side of the category.
In full
Every pick, and what is wrong with it
Published specifications only, each linked back to the page it came from. Where a manufacturer publishes nothing, the row says so — we do not fill blanks in.
1. Better for building
GraviTrax Starter Set
Ravensburger · 27597 · maker rates it 8+
122 pieces across 18 construction element types, including a vortex, a launch pad and a magnetic cannon.
- Pieces
- 122
- Construction elements
- 18 types, including base plates, height tiles, curves, junctions, switches, tracks, a vortex, a launch pad and a magnetic cannon
- Marbles
- 6
- Stated age
- 8 and up
Ravensburger publishes 122 pieces across 18 construction element types — base plates, height tiles, curves, junctions, switches, tracks, a vortex, a launch pad and a magnetic cannon — with 6 marbles, nine included track designs, nothing consumed, rated 8 and up. It also publishes a large expansion range built to enlarge the same system.
Eighteen element types is a vocabulary, not a set of answers. Once the nine designs are done, GraviTrax is a construction kit with no correct result, which is why it keeps going where a puzzle stops.
The named action pieces matter too. A vortex, a launch pad and a magnetic cannon mean the run does something on the way down rather than merely descending.
Replay signal
- Open-ended or one-shot
- Open-ended once the nine included designs are done — the system is a construction kit, not a puzzle with an answer
- Does anything run out
- Nothing runs out
- Room to grow
- Ravensburger publishes a large expansion range built to enlarge the same system
Why we say so: Ravensburger publishes the 122-piece count, the 18 construction-element types, the nine included track designs and an expansion range designed to extend the same track system.
What’s wrong with it
Six marbles and nine included designs, and after that the child supplies the ideas.
| Pieces | 122 |
|---|---|
| Construction elements | 18 types, including base plates, height tiles, curves, junctions, switches, tracks, a vortex, a launch pad and a magnetic cannon |
| Marbles | 6 |
| Stated age | 8 and up |
| Track designs included | 9 |
| Consumables | None |
Every figure above is from Ravensburger, GraviTrax Starter Set. Blanks are shown as “not published” rather than filled in.
2. Better as a puzzle
ThinkFun Gravity Maze
ThinkFun · 44001006 · maker rates it 8+
60 challenges from beginner to expert, with a marble that proves the solution.
- Challenges
- 60, beginner to expert
- Contents
- Game grid, 9 towers, 1 target piece, 3 marbles, 60 challenge cards
- Players
- 1
- Batteries
- None
ThinkFun publishes 60 challenges from beginner to expert, with a game grid, 9 towers, 1 target piece, 3 marbles and 60 challenge cards, single player, no batteries, rated 8+.
Each card fixes some pieces and hands the child the rest. The job is to work out where they go so the marble lands on the target — a logic problem with a physical proof, which is more satisfying than a flat puzzle clicking into place.
The towers can be used freely once the cards are done, though nothing in the box prompts that. Treat it as sixty good puzzles rather than a system.
Replay signal
- Open-ended or one-shot
- Finite by design — 60 challenges, and a determined child will finish them
- Does anything run out
- Nothing physically runs out, but the challenge cards do end
- Room to grow
- The towers can be used freely once the cards are done, though nothing in the box prompts that
Why we say so: ThinkFun publishes 60 challenges and a fixed component list. Sixty is a real number with a real end, and single-player puzzle games are the category where that matters most — better to know before you buy it as the main present.
What’s wrong with it
Sixty challenges is a real end.
| Challenges | 60, beginner to expert |
|---|---|
| Contents | Game grid, 9 towers, 1 target piece, 3 marbles, 60 challenge cards |
| Players | 1 |
| Batteries | None |
| Stated age | Ages 8+ |
| Consumables | None |
Every figure above is from ThinkFun, Gravity Maze. Blanks are shown as “not published” rather than filled in.
3. The in-between
Q-BA-MAZE 2.0 Big Box
MindWare · 48168W · maker rates it 6+
72 interlocking cubes with three exit types, so a structure branches.
- Cubes
- 72, in five colors
- Cube mix
- 18 bottom-exit, 36 single-exit, 18 double-exit
- Marbles
- 20 steel
- Stated age
- 6 and up
MindWare publishes 72 cubes in five colors — 18 bottom-exit, 36 single-exit and 18 double-exit — with 20 steel marbles, in phthalate-free and BPA-free ABS, rated 6 and up.
It builds like GraviTrax and fits a table like Gravity Maze. Three exit types are what make a structure branch rather than follow one path.
Replay signal
- Open-ended or one-shot
- Genuinely open-ended — the cubes interlock in any direction, so there is no single correct structure
- Does anything run out
- Nothing runs out
- Room to grow
- MindWare sells stunt and expansion sets that clip into the same cubes
Why we say so: MindWare publishes the 72-cube count, the exact exit-type mix, the 20 marbles and the ages 6+ rating. Three different exit types is what makes a structure branch rather than follow one fixed path.
What’s wrong with it
Twenty steel marbles is the part that goes missing under the sofa.
| Cubes | 72, in five colors |
|---|---|
| Cube mix | 18 bottom-exit, 36 single-exit, 18 double-exit |
| Marbles | 20 steel |
| Stated age | 6 and up |
| Material | Phthalate-free and BPA-free ABS plastic |
| Consumables | None, though marbles are the part that disappears under the sofa |
Every figure above is from MindWare, Q-BA-MAZE 2.0. Blanks are shown as “not published” rather than filled in.
Skip this one
Marble Genius Marble Run Super Set
Marble Genius · Super Set · maker rates it 4-8
A 150-piece marble run published for ages 4-8 — its range ends where both of these begin.
- Total pieces
- 150
- Track pieces
- 85 translucent pieces in 19 distinct styles
- Marbles
- 65 glass
- Bases
- 8 solid bases, of which 3 are large
Marble Genius publishes 150 pieces in total — 85 translucent track pieces in 19 styles, 65 glass marbles and 8 solid bases, 3 of them large — for ages 4-8.
A good first marble run at five. For a child old enough for Gravity Maze or GraviTrax, its published range is already ending.
Replay signal
- Open-ended or one-shot
- Open-ended construction, with the marble supplying an immediate success condition
- Does anything run out
- Nothing runs out
- Room to grow
- Expansion sets in the same system; the base count is what limits height
Why we say so: Marble Genius publishes 85 track pieces across 19 styles and 8 bases including 3 large ones. The base count is the number to watch: bases decide how tall a run can stand before it topples, and a set with plenty of track and too few bases builds low and disappoints.
What’s wrong with it
Ages 4-8 on the maker's own listing.
| Total pieces | 150 |
|---|---|
| Track pieces | 85 translucent pieces in 19 distinct styles |
| Marbles | 65 glass |
| Bases | 8 solid bases, of which 3 are large |
| Stated age | Ages 4-8 |
| Consumables | None, though 65 marbles is a number that only goes down |
Every figure above is from Marble Genius, Marble Run Super Set. Blanks are shown as “not published” rather than filled in.
We are not putting a buy button on this one. It is easy enough to find if you want it anyway — but we would rather send you to something that gets played with twice.
Questions people actually ask
Frequently asked
Is Gravity Maze or GraviTrax better?
It depends whether the child wants to solve or to build. ThinkFun publishes Gravity Maze as 60 single-player challenges with a grid, 9 towers and 3 marbles. Ravensburger publishes the GraviTrax Starter Set as 122 pieces across 18 element types with nine included designs. Both are rated 8+.
Is Gravity Maze the same as GraviTrax?
No. Gravity Maze is ThinkFun's single-player logic puzzle, and GraviTrax is Ravensburger's marble-track construction system. Both are listed on Ravensburger's US site, which is why they are often confused.
What age is GraviTrax for?
Ravensburger publishes the GraviTrax Starter Set for 8 and up. ThinkFun publishes Gravity Maze for 8 and up as well. For six and seven, MindWare publishes Q-BA-MAZE 2.0 from age 6.
How many challenges does Gravity Maze have?
ThinkFun publishes 60, from beginner to expert. Sixty is a real end, which makes it an excellent second present rather than the main one. The Gravity Maze review.
Sources
Where these figures came from
Every specification on this page traces to one of these. If a manufacturer publishes nothing on a point, the page says so rather than filling the gap.
Read next
Where to go from here
Back to Math & Logic, or read how we pick.