Subscribe to Pocket Gamer on
You'll need to fall through portals and push boxes in the tricky puzzler Cell 13, available on iOS and Android.

As a metallic sphere, you roll through minimalist 2.5D levels, navigating gaps and barriers with a myriad of special items. Portal boxes are perhaps the most versatile. letting you plug gaps, activate switches, and use momentum to perform far leaps.

The side-scrolling puzzles are divided across 65 levels, and evolves from simple boxes to activating laser bridges as you encounter more complex challenges.

You can purchase Cell 13 for £2.99 / $2.99 on the App Store and Google Play.