For iPhone and iPad

Relay: Circuit Puzzle

Every pulse counts.

Build a signal machine from simple parts. Guide pulses through three beats and hit the number at every outlet. Start with 90 free puzzles to learn and explore.

Coming soon to the App Store

Relay on iPhone: parts on the board and exact targets at the four outlets

Build. Test. Understand.

A clear target

Sixteen cells, three beats, four outlets. Arrange the parts to deliver the required amount to each outlet. Most targets are exact; the few minimum targets carry a +.

Learn by trying

Ten short lessons, an interactive parts handbook and free hints help you get started. Drag parts onto the board or tap to place them. Each test shows you what your machine does.

Two new ways to think

Prism adds branching and new routes. Echo works with memory and timing. Each separately sold, one-time purchase contains 90 levels, four parts and 30 run sequences. Both kits have a free preview.

Twelve rounds for your idea

In the open building mode, choose new parts as you go and develop your machine. Each kit has 30 fixed run sequences. The daily selection rotates through this collection.

Relay

Room for your solution.

90 free Base levels across six chapters
270 campaign levels with both optional kits
Free hints and unlimited attempts
Play offline; sync progress through your private iCloud
English, German, French, Italian and Spanish
No ads, separate app account or tracking

For iPhone and iPad. Free app with optional one-time In-App Purchases. Purchases and iCloud sync require internet.