SOKOBAN

I believe that all levels not in my two messages have been solved, except for bugs in the system like http://game-sokoban.com/index.php?mode=level&lid=2026 There are 141 such levels

the following levels are all impossible (non exhaustive list; most likely some of the levels from my previous message are impossible too). All are user levels -521 -700 -949 -832 -1916 -2413 -1547 -3880 -2650 -2333 -2315 -2341 -2390 -2356 -2344 -2358 -2320 -2362 -2375 -2368 -2353 -2371 -2374 -2328 -2354 -2316 -2261 -2367 -2364 -2372 -2343 -2369 -2347 -2348 -2357 -2359 -2336 -2416 -2309 -2327 -2382 -2350 -2346 -2296 -2355 -2337 -2317 -2307 -2324 -2318 -2345 -2308 -2304 -2342 -2338 -2323 -2312 -2335 -2302 -2319 -2340 -2332 -2352 -2326 -2322 -2265 -2321 -2331 -2334 -2314 -2325 -2311 -2329 -2301 -2313 -2266 -2305 -2294 -2310 -2299 -2306 -2300 -2303 -2264 -2295 -2298 -2406 -2986 -4427 -2297 -2404 -2401 -2591 -2420 -3165 -4203 -2421 -3693 -3149 -2408 -2419 -2627 -4640 -2384 -2410 -4505 -3527 -4195 -4426 -2422 -2418 -3870 -2396 -2405 -4472 -2400 -3213 -2626 -2361 -2395 -2412 -2402 -2409 -2414 -2386 -2392 -2407 -2417 -2378 -2385 -2379 -2376 -2629 -2393 -2381 -2360 -2415 -2387 -2403 -2365 -2398 -827 -778 -886 -2068 -1875 -1532 -2035 -1187 -1531 -1693 -1018 -1538 -2262 -2032 -859 -1730 -1950 -832 -577 -579 -1543 -606 -728 -878 -367 -512 -901 -521 -1916 -2373 -2380 -3125 -2397 -2351 -2399 -2377 -2389 -2366 -3162 -2391 -2915 -2330 -2383 -2388 -2339 -2394 -2349 -2411 -2370 -4785 -4855 -4876 -4877 -4953

the following levels have no solutions (probably this is an exhaustive list of all possible such levels, but I can't guarantee that). Negative ID are submitted levels, positive are collections 46617 46630 47372 47400 47413 47415 47418 47425 -916 -917 -918 -3017 -4136 -4351 -4378 -4452 -4735 -4738 -4742 -4745 -4768 -4776 -4790 -4824 -4937 -4965 -4978 -4981

@anian: I haven’t been very active as a player in 2025 so far, but I still keep an eye on the site, so I’m happy that I was able to help. My analysis didn’t cover the Submitted Collections as that would have required too much effort to determine manually (and perhaps I should have mentioned that), but hopefully our Admin can implement that functionality per your original request. From casual observation, I’ve seen a lot of user-submitted levels where it is immediately obvious that they cannot be solved. In a few cases these were probably published accidentally, but mostly it would be because of insufficient testing during the design process. Either way, it would be good to have a means of easily identifying and removing these, as you suggested. There is always an option to ask for specific levels to be deleted of course, but given the amount involved it would be great if this process could be automated in some way (ideally, the author should be notified of the intention to delete their level to give them an opportunity to submit a “corrected” version - however, some authors might not use the site anymore, so this may not be practicable in every instance).

@Mr.Kem Thank you! I don't know how you figured that out. It would be nice to have a page that shows all of the unsolved levels. The levels you have listed are just from the "Collections". It does not show any of the "Submitted Collections". It would be nice to have an unsolved level page each category (collections vs submitted collections). This way, hopefully we can have an easier way to find and get rid of the real unsolvable levels on this site.

@anian: according to the statistics listed on the “About” page, the number of solved puzzles on this site is currently 45432 of 45440. By looking at the most recently added sets, I was able to discover the identity of the 8 unsolved levels. These are as follows: “XIAN” level 63 (lid=46617). “AC 2021/22” level 18 (lid=46630). “HX” level H47 (lid=47372); level H75 (lid=47400); level H88 (lid=47413); level H90 (lid=47415); level H93 (lid=47418); level H100 (lid=47425).

@admin Is there any easy way to see all of the unsolved levels? I am referring to levels where no one submitted any solutions yet.

Note that if you didn't do step 1, it will register the solution under the name "anonimous". If you login, it will register it under your login user name.

continue from the previous post: (9). At the bottom-right of the level, there are three icons: half-moon, heart, question mark. Question mark is to get level data (like XSB). Heart is to make it your favorites. Half moon is to save/load snapshots. Click on the half-moon icon and it will open a popup window. It should also loaded the solution. At the top of this popup window, there is a slider bar. You can slide it all the way to the right to jump to the end of the solution. Then, just click on the "X" to close this popup window. Now, the level should show the level in the solved state. At the top-right corner, there are five icons that looks like the VCR button controls: fast-rewind, rewind, stop, forward, fast-forward However, the site names these buttons differently. They are named: move back animation, move back, stop, move forward, move forward animation. Click on the "move back" button to undo one move. Now, manually complete the last move to solve the level. It will register it as you solved the level.

I tested again on two levels (4337 and 4898) just to confirm the process. I wrote my own step by step process so I can follow it in the future. I am going to post it here, hopefully someone will find it useful. How to submit LURD solution to game-sokoban.com: (1) Make sure you're login. (2). Go to this page http://www.game-sokoban.com/solutions.htm (3). Select the proper collection type: Provided or User Submitted. (4). Enter the level ID (5). Paste the LURD string into the "Solution to import" textarea. (6). Click "import solution". and then it should say successful and there should be a small graphical icon showing the level to the right of the textarea where you pasted the LURD string. At this point, the solution is saved to your browser. It is not loaded to the site. (7). Click on the level graphical icon and it should open the level on a new tab/window. (8). On the level's page, at the bottom-left of the level section, you should see a greenish star. To the right of the star should say "load your solution: xxxx moves". Click on "load your solution" and it should load the solution into the buffer.