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Goal can be changed at restart
8 (with goal choice). Fair upfront price — pay once, play forever. Ad free. Slide tiles to order (enjoy "wooden click" sounds when move a tile or when a tile cannot be moved), shake to start new game (and enjoy "rattle" noise).
Sound on/off button (remember switch Ring/Silent position too). Player can choose another goal after 1 minute (or keep current goal). Fits "one-finger game": all tiles and buttons are reachable by the thumb.
2/20/2024 version 1.0 Appeared on the AppStore $0.99
Future FREE game with ad banner (clear space) at the bottom
PLANS (in February 2024):
8 max (extended) . At least 10 more goals: numbers ordered vertically and in reverse order.
8 light (or "mini"). Very plain design. No goal choice. FREE.
Good candidate to add AdMob. Banner at the bottom, far from control buttons (actually one real "control button" only: sound on/off. However, tiles also "interactive buttons"). And full-screen "interstitial" when game restarts. Perfect combination.
Win screenshot (in game description on AppStore) helps to clarify goal configuration.
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Maxi-version. Need to find compromise between simple design and 10+ goal choice (menu?)
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Mini-version (FREE) is ready. Will be sent to review in March'24
* mini version was rejected 29/2/2024
Classic "15"
The most studied size. Game 4x4 became canonical (wikipedia).
4x4 - classic "15" - app allows to restart after 2 minutes of gaming. Wooden sounds, shake to shuffle. No goal choice.
Classic goal configuration: tiles arranged in ascending order left to right, top to bottom, keeping open position in the bottom-right corner. I restricted starting configs by all with open position in the bottom-right corner. It gives15! and half of them are solvable.
Half-way done in 15 minutes
5x5, 6x6 ... up to 10x10 (about 30 minutes to solve).
Larger than 10x10 is possible, but on iPad mostly — tiles became pretty small on iPhone screen to move by finger (and to recognize the numbers). Allows to restart after 15 minutes.
(I like that 10x10 board fits double-digit tile numbering: the largest is 99.)
You can choose 3x3 or 5x5 board (I skipped classic 4x4 named "15").
3x3 board comes with 3 goals, 5x5 comes with 5 goals.
Price the same $0.99, no ad, no in-app purchases.
--- separate 5x5 "24 (with goal choice)" was rejected in August 2024.