is diverse, and classifications can vary. Doki Doki Penguin Land allowed players to run and jump in typical platform fashion, but they could also destroy blocks, and were tasked with guiding an egg to the bottom of the level without letting it break. The Lost Vikings (1993) was a popular game in this genre. It has three characters players can switch between, each with different abilities. All three characters are needed to complete the level goals. This subgenre has a strong presence on handheld systems. Wario Land 2 moved the Wario series into the puzzle-platform genre by eliminating the element of death and adding temporary injuries, such as being squashed or lit on fire, and specialized powers. Wario Land 3 continued this tradition, while Wario Land 4 was more of a mix of puzzle and traditional platform elements. The Game Boy update of Donkey Kong was also successful and saw a sequel on Game Boy Advance: Mario vs. Donkey Kong. Klonoa: Empire of Dreams, the first handheld title in its series, is also a puzzle-platform game. Through independent game development, this genre has experienced a revival since 2014. Braid uses time manipulation for its puzzles, and And Yet It Moves uses frame of reference rotation. In contrast to these side-scrollers, Narbacular Drop and its successor, Portal, are first-person games that use portals to solve puzzles in 3D. Since the release of Portal, there have been more puzzle-platform games which use a first-person camera, including Purity and Tag: The Power of Paint. In 2014, Nintendo released Captain Toad: Treasure Tracker which uses compact level design and camera rotation in order to reach the goal and find secrets and collectibles. Despite lacking jump ability, Toad still navigates the environment via unique movement mechanics. Run-and-gun platform game The run-and-gun platform genre was popularised by Konami's Contra. Among the most popular games in this style are Gunstar Heroes and Metal Slug. Side-scrolling run-and-gun games marry platform games with shoot 'em ups, with less tricky platforming and more shooting. These games are sometimes called platform shooters. The genre has arcade roots, so these games are generally linear and difficult. There are games which have a lot of shooting but do not fall in this subgenre. Mega Man, Metroid, Ghosts 'n Goblins, Vectorman, Jazz Jackrabbit, Earthworm Jim, and Turrican are all platformers with shooting, but unlike Contra or Metal Slug, platforming, as well as exploring and