ilu is a puzzle game.

In every puzzle, all that is dark must light up.

You place a light by tapping a dark area.

You will discover clever ways to place the lights as you play the game.


ilu is light.

You are a keeper of light.

In the vast void of space, countless lost worlds drift in the dark. Planets that have lost their star mothers and are too far and cold for the rays of starlight to warm their dark and frozen features.

It is your mission to terraform these barren planets.
As you spread light through the worlds of ilu, watch the ground light up while colorful and beautifully animated plants sprout as the entire world gently teems with life.


• Infinite relaxing logic puzzles solved with light
• Simple rules that create compelling solutions
• Dynamic music that responds to your play
• An animated & intelligent hint system that teaches & guides your way

The puzzles of ilu can be solved with pure logic alone. We wanted to share the wonderful "aha!" moments of discovering the solutions with you.

ilu is supported with ads, but you have the option to permanently remove the ads from the game with an in-app purchase.

What's New

Version 1.0.8

Thanks so much for playing ilu! We've got a few new features in this update that we hope you'll enjoy:
- Daily puzzles
- New animations

Ratings and Reviews

4.7 out of 5

1.1K Ratings

1.1K Ratings

Challenging and fun app, one minor issue


The game is one of logic played on a grid, and the basic idea is to completely fill the grid with light by touching the various squares of the grid. But there are restrictions on how certain parts of the grid can be filled, and therein lies the challenge. Been playing this game a month or two now. I was abysmal in the beginning—no clue what was going on!—but I persevered and made the game my brain challenge. It’s fun!
So now that my brain is better at this, I wish there was one minor issue that could be resolved. As you are working through the grid, you can place “markers” with either a swipe or a double tap to indicate that a particular square can’t logically be illuminated. Lights, by contrast, are placed with a single tap. Now, I am 55, and the fingers aren’t as nimble as they used to be, so I am constantly frustrated that my otherwise perfect score is messed up by the game interpreting my double tap to place a marker as a single tap to place a light. I’ve tried using the swipe instead with no better results. Not sure what I can suggest as an alternative, but perhaps the developers could do some testing on their parents or grandparents to see what they can come up with. After all, it’s our age group that needs this kind of game! ;)

Developer Response

Hi Daboss- Thank you so much for playing, and for this great feedback! We are definitely keeping this in mind :)

Beautiful game, but...


So, I really do love this game, it’s beautiful and relaxing. The varying difficulties are wonderful if you’re looking for something challenging one day and something a little easier the next. I have also noticed that the developer responds to a fair number of these reviews when people bring up problems which leads me to the only complaint I have so far — on the past few levels I’ve played, when I’ve placed a marker on a square to eliminate it, I’ve been penalized with that red bar at the top. It’s incredibly frustrating because I know that square can’t be lit, but I can’t actually place the marker, and on the bigger levels it’s a lot of information to try and keep track of.

Thanks in advance for reading my review!

Developer Response

Hi Dragonlady- Thank you so much for playing :) We are so sorry about this marker bug, and we're going to have a fix available asap! If you press the settings button in the upper righthand corner and switch your marker mode from from Double Tap to Swipe then you'll be able to enter markers without penalty in the meantime. Our apologies again!

Interesting Game


Let me preface this review with a note that I am in recovery for a severe left frontal lobe traumatic brain injury.

Because of the damage to audio circuits, I am unable to tolerate the music and sounds to most game—this one included. Luckily, there is a setting for no music/no sound. This means I am not getting the full zen effect the game promotes.

It takes a while for my brain to catch on to new games. This one included. I am playing on very easy. I do not appreciate the game asking me at the end of every game to increase my difficulty level. It has even tried changing the setting for me. I know how rapidly to advance new stimulus to my brain.

The graphics are delightful. The game stimulating.

I can only play in short stints—maybe 3 or 4 patterns worked, then off. I also find I must limit play to once a day, skip a day or two, play another day. Here again, this is limits of TBI.

I would definitely recommend this game, just pay attention to your own reaction to the game and play accordingly.


Brainium Studios LLC
333.4 MB
Requires iOS 9.0 or later. Compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad (5th generation), iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro (2nd generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro, 10.5-inch iPad Pro Wi‑Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), and iPod touch (6th generation).
Age Rating
Rated 4+
© Brainium 2018
In-App Purchases
  1. Unlock Ad-Free $7.99
  2. 100 Ad-Free Puzzles $0.99
  3. Pod $2.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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