Play the puzzle game with your own wits or you can use this very helpful guide created by lylat and Pris. It takes around 30min to complete the 75 levels using the guide. Though the puzzles themselves are pretty fun to play.
https://test1.login.steam.hlxgame.cc/sharedfiles/filedetails/?id=2267583602

By completing the levels, you earn hearts to purchase the option to view the girls in the gallery. Once youve completed all the levels. you get all the achievements besides the ones for viewing the girls, which will be earned once you have done so











Go to the gallery section from the main menu and from there you can view them











Purchase each one using the hearts and from there, view to your hearts content ;)

There are five section of viewing for each girl. Just uploading the first three of each since the last two are perhaps too lewd.