A word game in Crux # Think 21 > Think 21 is a word game in Crux, free on iPhone and iPad with no ads. The oracle hides one word. Ask any question to narrow it down. Each question costs one. Spend them on big buckets first. Twenty questions, and this time I get to ask them. Get Crux Free on iPhone and iPad. No ads. ## How to play Think 21 - **Ask The Oracle.** The oracle hides one word. Ask any question to narrow it down. - **Twenty One Tries.** Each question costs one. Spend them on big buckets first. - **Four Answers.** The oracle says yes, no, sometimes, or unknown. Read them like a thermometer. ## How it fits your day Think 21 is one of a ton of games in Crux, with a new set of daily puzzles every day, no ads and nothing you have to buy to play. Your streak grows each day you play, and you can compare results with friends (friends are off under 13). Crux has a No Wifi section with practice rounds you can play offline; the daily games download each day's puzzle when you are online. ## Who it suits If you like Akinator, Twenty Questions or 20 Questions, Think 21 will feel familiar. It suits people who like word games and a short daily puzzle. ## Similar games you may know - **Akinator**: genie guessing who you think of. - **Twenty Questions**: ask questions to guess the word. - **20 Questions**: classic yes no guessing game. - **20Q**: the handheld twenty questions toy. These are other games, listed so you know what Think 21 is like. Crux is not connected to them. ## About Crux Crux is a free iPhone and iPad app from Pizzart Pte. Ltd. with a ton of daily word, logic, number, geography, trivia, colour and arcade games, and no ads. Every game is free to play and none needs a purchase: some open after a few days of play, or sooner with coins you earn by playing. Optional Crux Plus costs $4.99 a month or $39.99 a year in the US. [The facts](https://crux.quest/ai) · [Questions](https://crux.quest/faq) · [What no ads means](https://crux.quest/no-ads) ## More games like Think 21 - [Rooftop](https://crux.quest/games/rooftop/) - [Heat Cue](https://crux.quest/games/heat-cue/) - [Quartet](https://crux.quest/games/quartet/) - [Letter Swap](https://crux.quest/games/letter-swap/) - [Bracket Peel](https://crux.quest/games/bracket-peel/) - [Quad](https://crux.quest/games/quad/) [See all games](https://crux.quest/games/)