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By IBA Puzzles

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MONORAIL: a new logic puzzle for touch screens.

✔ 50 FREE puzzles, 350 more via in-app purchase
✔ Fosters development of visual/spacial reasoning skills
✔ Works great on iPad
✔ Simple to learn, challenging to master
✔ Puzzles range from easy to super-hard
✔ Designed by nerds, fun for all

Monorail is challenging and fun like sudoku, and entirely visual/spacial/geometric. There are no numbers or symbols. You solve puzzles by drawing rails to create a working monorail system.

The object of each puzzle is to create a single loop (closed path) of rails connecting all stations so the monorail can circle around endlessly.

Kindergartners can solve the beginner levels. Mathematicians from MIT have struggled to solve the most difficult ones.

Get on the Monorail train today!

We hope you enjoy.

-- IBA Puzzles (Glenn and Aaron Iba)

We welcome your feedback at

What's New in Version 1.2.1

• 2 additional puzzle packs available for in-app-purchase:
[one with 240 square and rectangle puzzles,
the other with 240 Hex and Hex-Rectangle puzzles]
• Larger and more challenging puzzles included in the 2 new puzzle packs
• Discounted pricing on new puzzle packs (after solving all FullVersion puzzles)
• Ads to support the free version
(removed after completing any in-app-purchase)
• New graphics
• Better support for sound (e.g. background music on iPod should now play ok)
• Option to disable "error alerts" (red coloring of constraint violations)
• Fixed bug where 1.0 users who previously purchased Full Version were incorrectly seeing ads in 1.2. Our apologies!
• Fixed crash-on-startup bug affecting iOS3 users.

Please e-mail any bug-reports, problems, or other feedback to

iPhone Screenshot

iPhone Screenshot 1
iPhone Screenshot 2
iPhone Screenshot 3
iPhone Screenshot 4
iPhone Screenshot 5

Customer Reviews

Monorail is a challenging find

My twin brother LOOOVES logic puzzles. You know, the ones with the boxes, where you have to find out which of four friends in a coffee shop had both a black coffee and a bagel while wearing a green sweatsuit, but he gets bored easily, so I decided to buy him an app on my phone he could use when we were both out together, at appointments or whatever. The problem is, I won't put it down long enough to let him play it! I figured, "We'll just do the free version", and a day later, I'd bought the full! These puzzles are RIDICULOUSLY frustrating, but once you FINALLY find the right answer, you want to keep doing more. Probably my favorite thing about games like this and Temple Run is that you can put it down, but you're always willing to pick it back up.

Wish I could give this ten stars!!!

Simple and Fun

An enjoyable set of puzzles. Simple, fun, and with a smooth interface that makes it easy to think about the puzzle and forget that you're drawing with your finger on a tiny screen.

The puzzles on a hex grid add a whole new dimension. It's like two games in one! It's also very nice that you can try before you buy. I bought the upgrade for more puzzles after only a few minutes. With the latest update they have added even more puzzle packs, for more replayability value. Definitely worth it.

The graphics seem fuzzy. I keep thinking I need new glasses, but it's just the way the graphics are. Maybe not designed for Retina Display. You can see this in the screenshots. Perhaps this will be updated in a later version.

Amazing, but...

I absolutely love this game! I'd completed the 50 free levels in one day! Now here's where the 'but' comes to play. Upon completing the free version, I wanted to purchase the full game, however. I wasn't 'allowed'. My in-app purchase is off, which means I should be successful in my attempts to purchase items when outside the app store. Why not just have the full version sold separately within the app store? If anything, I will continue to try because I really do like this game and the relaxation that goes alongside it! Good job people!!! lol :-)

View In iTunes
  • Free
  • Category: Games
  • Updated:
  • Version: 1.2.1
  • Size: 5.3 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 3.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

Current Version:
All Versions:

Top In-App Purchases

  2. Rectangle Puzzles$1.99
  3. Hexagon Puzzles$1.99
  4. Rectangle Puzzles (discounted)$0.99
  5. Hexagon Puzzles (discounted)$0.99