Free to play, no sign-up
Free 3D Puzzles, New Every Day
Build today's 3D puzzle from its top, front and side views, then take a 5-question spatial reasoning test. Free in your browser.
3D puzzle game, daily
Build the solid that has these three views
Tap a square to drop a cube. Drag to turn the view.
matched to build extra line to make wrong line
This is the main puzzle in THINK IN 3D: 120 of them, from whole cubes to 45° slopes.
Four kinds of puzzle
Play Train Tracks and spatial reasoning here for free. Murder mysteries and mystery coloring live in paperback books.
Train Tracks
Lay one railway across the grid using the numbers around the edge.
Murder mystery logic
Detective cases solved by deduction alone: case files, crime maps, picture-logic evidence and a 17,600-suspect guest book.
Spatial reasoning
Read the top, front and side views, then rebuild the 3D solid in your head.
3D puzzles you solve by thinking, not guessing
Spatial reasoning is the skill of picturing a 3D shape from flat drawings and turning it in your head. It shows up in school entrance tests, aptitude tests, engineering drawing and design, and it gets better with practice. Every 3D puzzle here gives you everything you need on the page: each test question has exactly one answer you can prove from the views, and in the building game any solid that matches all three views wins.
What you can play today
The 3D puzzle game: build a solid from its top, front and side views, with a new puzzle every day. A free 12-question spatial reasoning test scored by skill, a daily five-question 3D test, plus practice with cube nets, counting cubes and mental rotation. Missed a day? Every past puzzle is in the daily 3D puzzle archive. For a change of pace, try Train Tracks, a route-finding logic puzzle with 140 puzzles.
Books and printables
Prefer paper? Download the free 3D puzzles PDF or the Train Tracks sample, or pick up a Milo Marwick puzzle book. You can read how the puzzles are made on the about page.
Frequently asked questions
What is a 3D puzzle here?
You see a stack of cubes as three flat drawings: the top view, the front view and the left side view. Your job is to work out the 3D solid that makes all three. In the daily 3D puzzle game you build it cube by cube; in the spatial reasoning test you pick the right view or solid from four options.
Who is Milo Marwick?
Milo Marwick is the name behind a series of logic puzzle books, including the 3D spatial reasoning book THINK IN 3D, and this free puzzle site. Everything you need is on the page: every quiz question has one answer you can prove by reasoning, and in the 3D building game any build that matches all three views wins.
Is it really free?
Yes. Every puzzle on the site is free to play and print, with no account. There is an optional email list for a free PDF pack and a weekly puzzle.
Which puzzles can I play?
A daily 3D puzzle game and a 5-question spatial reasoning test, practice pages for orthographic views, mental rotation, cube nets and counting cubes, and a free printable 3D puzzle PDF. There is also Train Tracks, a route-finding logic puzzle with a daily puzzle and a library from easy to expert.