Ice climbing is the activity of ascending inclined ice formations. Usually, ice climbing refers to roped and protected climbing of features such as icefalls, frozen waterfalls, and cliffs and rock slabs covered with ice refrozen from flows of water. For the purposes of climbing, ice can be broadly divided into two spheres, alpine ice and water ice. Alpine ice is found in a mountain environment, usually requires an approach to reach, and is often climbed in an attempt to summit a mountain. Water ice is usually found on a cliff or other outcropping beneath water flows. Alpine ice is frozen precipitation whereas water ice is a frozen liquid flow of water. Most alpine ice is generally one component of a longer route and often less technical, having more in common with standard glacier travel, while water ice is selected largely for its technical challenge. Technical grade is, however, independent of ice type and both types of ice vary greatly in consistency according to weather conditions. Ice can be soft, hard, brittle or tough. Mixed climbing is ascent involving both ice climbing and rock climbing.
Ice Climber (アイスクライマー Aisu Kuraimā) is a vertical platform video game developed and published by Nintendo for the Nintendo Family Computer in Japan and the Nintendo Entertainment System in North America in 1985. In Ice Climber, the characters Popo (ポポ) and Nana (ナナ), collectively known as the Ice Climbers, venture up 32 ice-covered mountains to recover stolen vegetables from a giant condor. In some European countries, the NES console was sold bundled with the game, increasing Ice Climber's familiarity outside Japan.
An alternate version was released in the arcades as part of the Vs. Series, known as Vs. Ice Climber (VSアイスクライマー VS Aisu Kuraimā). It includes gameplay features not found in the home console release, such as an animated title screen, stage select menu, 16 additional mountains, occasional blizzard and wind effects, more enemy characters, and bonus multiplier items.
The first player controls Popo, a boy wearing a blue Eskimo parka, while the second player controls Nana, a girl wearing a pink Eskimo parka. The only tool they carry is a wooden mallet to carve openings in the ice above and to club enemies. Each mountain level consists of eight layers of colorful ice and a bonus stage. Standard, dull ice blocks pose no threat other than an easily disposed of barrier and platform. Square ice blocks with higher detail are indestructible, forcing the player to take another path. Hatched ice acts as a conveyor belt sliding the Eskimo either left or right. Finally, many mountains include unbreakable moving platforms resembling clouds. The bonus stage takes place at the peak. Within a 40-second time limit and no enemies, the Ice Climbers often face trickier jumps and multiple moving platforms. The peak is also the only place to recover stolen vegetables, most notably eggplants. Collecting just one piece of corn from the fifth bonus stage is the only way to gain an extra life. At the top of the peak, the Condor (コンドル) flies overhead.