Other companies have also released nonogram video games, such as Falcross on iOS, and the Color Cross series of games by Little Worlds Studio on the Nintendo DS, Microsoft Windows, and iOS. In addition, nonogram puzzles have appeared in non-picross puzzle games, such as in Deadly Rooms of Death's fifth installment, "The Second Sky". In it, nonogram puzzles (again called "Picross" puzzles) representing in-game objects are optional, unlockable puzzles late into the game that can be played in the level "The Central Station", and solving them unlocks bonus levels in the game. In 2018, Konami released a game titled "Pixel Puzzle Collection", or "Picross Puzzle" (ピクロジパズル), featuring classic Konami characters and sprites.