seen in multi-level versions of the game. There are four primary scoring systems for such games. In one variation, each level has a target score. The player's score starts at zero, and the player must reach the target score. At the beginning of each level, the player's score is reset to zero; the target score increases with each level. Other versions have a cumulative target score. In these versions, the player's score carries over from level to level. As a result, if the player substantially exceeds the target score on a given level, they may enter the subsequent level having already met that level's target score, as well. BPop has a cumulative target score. Some versions maintain the same target score for each level; such variations can be played indefinitely. In such games, the player typically loses due to poor planning or a lapse in concentration. Examples of such games are Same Pets and Same Hearths. In games without a goal score, like Bonkers for iPhone and SameGameBros for iPhone, the goal is to clear the level completely. The game ends when the player fails to do so. Visuals Blocks typically appear as colored squares, circles, or spheres. Some variations use gradient shading to give the illusion of dimensionality. Other tile themes, or skins, include animals, hearts, stars, faces, Lego blocks, and jelly bears. Designs may follow a theme, such as Christmas or monochrome. Most games have only one skin, but others allow choosing from multiple skins. There is a special visual aspect in some versions; instead of separate blocks, games like iDrops and SameGameManiak feature bordered areas for adjacent blocks of the same color. Some have elaborate tile graphics, featuring pictures or patterns inside the tile, like KSame and Same GNOME. Variations Reveal the picture The SameGame concept can be extended to a "Reveal the picture" game. A picture or photo is behind the blocks; it becomes increasingly visible as blocks are removed, until it is completely revealed. Examples include Same Pets, Same Hearts and the Nissan Cube promotional app for iPhone. Animation Some games feature animation of one or more game events, such as cleared tiles bursting or exploding, or scoring animations (BPop, Bubblets Tilt). Block highlighting Some versions display which blocks are selected with a border around them (BPop), jittering of the blocks (BPop), or an increase of the size of the selected blocks (Bubblets Tilt). If