Euclidea review

Euclidea turns straightedge and compass constructions into short, satisfying puzzles. The US App Store listing describes 156 levels from very easy to really hard, 10 tools, an Explore mode with hints, and Game Center competition, and it states plainly: No Advertising. The Google Play listing repeats the point, saying there are no timers, no lives and no ads. Each solution is scored in lines and elementary constructions, so you can replay a level to find a shorter answer, and constructions you learn become shortcuts in your toolbox. The only in-app purchase listed on the US App Store is a $0.99 Night Mode. Limits: new levels open only after you solve the previous ones, the listing says completing the whole game requires earning all the stars, and the puzzles are all geometry. It runs on iPhone, iPad, Apple silicon Macs and Android. We compared documented features and published prices.

Who it is for

Students and adults who like math and geometry puzzles

Price

Free to play; Night Mode costs $0.99 on the US App Store.

Night Mode Provides access to a dark theme. $0.99
Quoted from the vendor pricing page on November 11, 2026.

Key features

• 156 levels from very easy to really hard on the App Store listing
• 10 construction tools plus an Explore mode and hints
• Scores for each solution in lines (L) and elementary constructions (E)
• Constructions you learn are added to your toolbox as shortcuts
• Game Center competition with friends

Strengths and weaknesses

• Strength: App Store listing states No Advertising, and the Google Play listing says no timers, no lives and no ads
• Strength: Only in-app purchase on the US App Store is a $0.99 Night Mode
• Strength: Available in English and 16 more languages
• Weakness: New levels open only after you solve earlier ones
• Weakness: Full completion requires earning every star unless you buy the in-app option the listing mentions
• Weakness: Geometry focus will not suit players who want word or number puzzles

Key facts

• Levels: 156
• Tools: 10
• Developer: HORIS International Limited
• Languages: English and 16 more

Where it ranks

Euclidea is No. 3 in our Best Free Puzzle Games Without Ads verdict.