Picross 3D: Round 2

Picross 3D: Round 2 known in Japan as Rittai Picross 2 (立体ピクロス Rittai Pikurosu 2, lit. "Solid Geometry Picross 2") is a puzzle video game developed by HAL Laboratory for the Nintendo 3DS. It is the sequel to the 2009 Nintendo DS game, Picross 3D. The game was released in Japan on October 1, 2015, in North America on September 1, 2016, in Europe on December 2, 2016, and in Australia on December 3, 2016. In North America, it was only released as a digital download.

Gameplay
The gameplay is pretty similar to the original. Players break or mark blocks according to the number on their to show a 3D model. Rows with no necessary parts in them are marked with a blue zero while the other rows are marked by a number indicating how many in a row matter. This entry introduced the orange numbers, which are blocks that do not fill an entire block and/or curved whereas blue numbers indicate straight square blocks that are used. The game also introduced the bomb button which eliminates any 0 blocks on the outer side.

The special challenges - Time, Construction and One Chance are returning from the previous game. This time, instead of being sorted by difficulty, the puzzles are scattered between themed 'books', and their difficulty is adjustable separately. Solving each puzzle rewards the player a gem. With the higher difficulty being selected and less number of mistakes made by player, a better type of gem would be rewarded; the best type is the rainbow colored one. Further books would be completing certain objective. Completing the first 40 books rolls the credits, with the other books serving as 'Extra' puzzles.

Each 3000 points earned (collectively) adds a stamp on the save file, designed as a 'Membership Card'. There are 10 stamps at all, and collecting all of them loads a special message.

The game also supports some amiibo figures, which scanning each will unlock a puzzle based on the scanned amiibo.

Book 8: Tips and Tricks, Vol. 1
This book teaches helpful tricks for solving the harder puzzles, in shape of 10 problems.

Book 13: Tips and Tricks, Vol. 2
Another 10 problems which are solvable by using certain tricks.

Trivia

 * This game and its predecessor, Picross 3D, were the only games in Picross series published by Nintendo which not made by Jupiter.
 * Although the "unsolved" pattern for the big Construction puzzles is a 12×12×12 cube, but it's only a placeholder.