# ilu — A logic puzzle of light & life > Logic puzzle game to illuminate dark worlds and foster life. (iPhone/iPad app by Brainium Studios LLC.) - Source: https://appshunter.io/ios/app/ilu/id1271512200 (this page in markdown: same URL + `.md`) - Developer: [Brainium Studios LLC](https://appshunter.io/developer/300891405) - Category: Games, Entertainment, Puzzle, Strategy - Price: Free with in-app purchases - Rating: 4.70/5 from 2,122 App Store ratings · 171 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 535 MB - Languages: American English - Released: 2018-05-03 - Data updated: 2026-08-17 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/ilu/id1271512200/reviews.md ## What is ilu? 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. STORY: 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. FEATURES: • 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. ## Key features - Infinite relaxing logic puzzles - Illuminate dark areas with light - Terraform barren planets - Discover clever solutions - Dynamic music - Animated hint system ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | 100 Ad-Free Puzzles | $0.99 | one-time | | Terra Suit | $0.99 | one-time | | Turbo Suit | $1.99 | one-time | | Spectral Suit | $3.99 | one-time | | The Botanic | $1.99 | one-time | | Pod | $2.99 | one-time | | Chromus | $4.99 | one-time | | Ayianna | $6.99 | one-time | | Unlock Ad-Free | $7.99 | one-time | ## What do users think of ilu? Overall sentiment: positive **Pros** - 🌟 Beautiful graphics and visuals - 🎶 Relaxing and soothing music - 🧠 Challenging and stimulating puzzles - 🆓 Free hints and no pay-to-win mechanics - 🕹️ Simple but unique gameplay mechanics - 🔄 Adjustable difficulty levels - 🧘‍♀️ Calming and zen-like experience **Cons** - 🤏 Small touch targets, especially on larger puzzles - 🤔 Difficulty in distinguishing markers from lights - 🔋 High battery consumption - 🐛 Occasional crashes and glitches - 📉 Lack of progress tracking or replay options **Commonly reported bugs** - App crashes on launch for some users - Placement of markers and lights not always registering correctly - Recent update changed visuals in a way that made the game less clear **Most requested features** - Zoom or pan functionality for larger puzzles - Separate marker and light placement modes - Progress tracking and ability to replay past puzzles - More variety in background music tracks ## Recent user reviews (10 of 171) All indexed reviews: https://appshunter.io/ios/app/ilu/id1271512200/reviews.md ### 3/5 — Steep learning curve *2026-07-23, version 1.0.10* The hint/tutorial system is woefully inadequate, especially on the larger puzzles. After a while it’s more frustrating than fun. ### 4/5 — Steep learning curve *2026-07-19, version 1.0.10* The tutorial system is a little clunky, but perseverance pays off! ### 5/5 — always there for me *2025-06-26, version 1.0.10* this is one of my all time favorite games. i’m not very good at it. i dont open it very often. but its always there when i need it most, to help me quiet my busy mind. 5 stars. ### 5/5 — Love this game, hope it stays available *2025-04-26, version 1.0.10* This is a super relaxing game! It has beautiful graphics between levels, and relaxing music as well. I play it a lot, often when watching TV. I know they stopped updating it; I just hope it will still be available to download when I get a new iPad. ### 5/5 — Never Delete!! *2024-12-31, version 1.0.10* Please never delete this app, it is SO amazing for my anxiety attacks! The music, the simple but beautiful puzzles, the calming colors and sounds. This is an S tier game and I wish I could get more people to download it. Sadly all my friends have Samsung 🥲 ### 5/5 — Muito lindo *2024-11-18* Muito perfeito, podia ter em português ### 5/5 — LOVE: I'm a forever ilu fan *2024-05-05* Ilu was my first Brainium game. I downloaded it after my Dad died in 2016 with Alzheimer's and I wanted to find ways to keep my mind sharp. I find that the logic activity in this game is that wonderful elusive mix of both challenging and relaxing/soothing for my mind and nerves. Plus the aesthetics and general sensibility of the game really appeal to me. Long after I leveled up to Expert and acquired all the avatars I wanted, I've continued enjoying daily play of the game while my crystals rack up for the fun of it (1.5M's on the near horizon)! Several years later, my ilu game is still elevating. I've gradually learned how to see the puzzles' logic in new ways, continually challenging myself to wean my play away from using this or that tool or help. Ilu's still my favorite game for hundreds of design reasons - the logic structure, the aesthetics, the levels, the tools, the daily challenge... PLUS, since it has no ads, I can make ilu a reliably good, clean, ad-free part of my daily puzzles and brain play. I was sad to read they've made their last updates - til I realized ilu's already really kinda perfect. I hope to play it for many years to come. Everything about ilu is frankly just right for me. ### 5/5 — Ilu *2024-02-05, version 1.0.10* Great challenge….beautiful graphics. ### 4/5 — Thoughtful Challenges *2023-12-02, version 1.0.10* Takes a while to learn to think ahead. But when those “Error Free” completions happen, it’s very rewarding. ### 5/5 — An Unexpected Pleasant Puzzler *2023-11-28, version 1.0.10* This game hasn’t received much attention so I wasn’t expecting much. I was pleasantly surprised to find a simple, unique, enjoyable puzzle game that I keep returning to day after day. The adjustable difficulty setting means it can customized for all skill levels. It also adds to the replay factor, since you can boost the difficulty and start over. Recommend for puzzle fans. ## Frequently asked questions about ilu ### What is ilu? ilu is a logic puzzle game where players spread light to illuminate dark worlds. As light spreads, the barren planets are terraformed, and animated plants and life begin to sprout, transforming the environment. ### How do you play ilu? You play ilu by tapping on dark areas to place lights. The goal is to illuminate all the dark spaces on the puzzle grid. The game features simple rules that lead to compelling and clever solutions discovered through pure logic. ### Is ilu free to play? Yes, ilu is free to play and is supported by ads. However, players have the option to permanently remove all ads from the game through a one-time in-app purchase. ### What are the key features of ilu? Key features include infinite relaxing logic puzzles solved with light, simple rules that create compelling solutions, dynamic music that responds to gameplay, and an animated, intelligent hint system that guides players. ### What kind of experience does ilu offer? ilu offers a relaxing and engaging experience focused on logic and discovery. The game aims to provide players with wonderful "aha!" moments as they uncover solutions, complemented by beautiful animations and responsive music. ## Version history (last 5 releases) ### 1.0.10 — 2021-08-17 This will be our final ilu update, so we've removed ads in addition to some bug fixes and improvements :) Thank you so much for playing! ### 1.0.9 — 2021-04-05 This will be our final ilu update, so we've removed ads in addition to some bug fixes and improvements :) Thank you so much for playing! ### 1.0.8 — 2018-09-10 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 ### 1.0.6 — 2018-07-05 Thanks for playing ilu, we hope you enjoy this update as much as we enjoyed making it! - Reduced download size for some devices - Reduced energy usage ### 1.0.4 — 2018-06-14 Thank you for playing ilu! We're excited to continue improving the game, below are some of the additions to the latest version. - Fixed a major bug that created negative energy in Double Tap marker mode - Fixed a text coloration bug that affected hints and tooltips - Made it much less likely to encounter a repeated puzzle ## Apps similar to ilu | App | Rating | Price | Category | | --- | --- | --- | --- | | [Ubi's Dimensions](https://appshunter.io/ios/app/ubis-dimensions/id1469107559) | 4.7 (1,758) | Free | Games | | [Otteretto](https://appshunter.io/ios/app/otteretto/id1608448950) | 5.0 (8) | Free | Games | | [Hashi: Linkdoku Bridges Puzzle](https://appshunter.io/ios/app/hashi-linkdoku-bridges-puzzle/id1638725709) | 4.6 (29) | Free | Games | | [Oculux](https://appshunter.io/ios/app/oculux/id1523406052) | 4.8 (199) | Free | Games | | [Sumaddle](https://appshunter.io/ios/app/sumaddle/id1552172214) | 4.9 (766) | Free | Games | | [The Hamiltonian Circuit](https://appshunter.io/ios/app/the-hamiltonian-circuit/id1484345208) | 3.8 (33) | Free | Games | ## More apps by Brainium Studios LLC - [Jumbline 2+ for iPad](https://appshunter.io/ios/app/jumbline-2-plus-for-ipad/id364900547) - [Jumbline 2 for iPad](https://appshunter.io/ios/app/jumbline-2-for-ipad/id374370928) - [Jumbline 2+](https://appshunter.io/ios/app/jumbline-2-plus/id384197252) - [Jumbline 2](https://appshunter.io/ios/app/jumbline-2/id384200512) - [⋆Word Search+](https://appshunter.io/ios/app/word-search-plus/id398081649) - [⋆Word Search](https://appshunter.io/ios/app/word-search/id400793434) All apps by Brainium Studios LLC: https://appshunter.io/developer/300891405 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-17.*