SD Gundam World: Gachapon Senshi - Scramble Wars (SDガンダムワールド ガチャポン戦士 スクランブルウォーズ?) is a combination turn-based strategy and action video game for Nintendo's Famicom Disk System. Gachapon Senshi is named for the toy capsule vending machines which gained popularity in Japan in the 1980s, and the SD Gundam World toys that became a huge hit with children. Gachapon Senshi was the first video game based on SD Gundam and also the first war game for the Famicom, starting trends that would inspire a number of sequels.

Scramble Wars was first released in Japan by Bandai in November, 1987. A rewrite of the first game's disk would be made available at in-store "Disc Writer" kiosks just two months later, in January of 1988, referred to as SD Gundam World: Gachapon Senshi - Scramble Wars Map Collection (SDガンダムワールド ガチャポン戦士 スクランブルウォーズ マップコレクション?) or Scramble Wars 1.5 once a sequel, Scramble Wars 2, was released in 1989. The Map Collection added ten new maps and decreased the loading and processing times.

To date, the game has only been officially released in Japan. Decades after its initial release, a single-player only port would be released for the Game Boy Advance in 2004 as the 30th, and final, entry in the Famicom Mini Collection of games. A second port was released online ten years later via the 3DS Virtual Console

Two teams, one colored blue, the other red, compete on top-down grid-based map in an attempt to conquer it to gain resources and defeat their enemy. Each team has a main base on the map, but there are also neutral cities throughout the map, which occupied by either team over the course of the game by moving a mobile suit onto its tile to gain control of it. The more cities a team has control over, the more energy that team produces every round to spend on rolling for newer and more powerful Mobile Suits. Each team only gets to issue three commands per turn in the base game, whether it be to move a unit around the map, or to construct a new unit at your base, though Scramble Wars 1.5 would double the number of allowable actions per turn to six! Mobile Suit forces for your team are constructed at your main base by drawing them from a gachapon machine. Each different mobile suit has different stats and plays slightly differently. In order to defeat each other, players must attack the opposing team's Mobile Suits by moving one of their own onto a tile currently occupied by an enemy unit.

When two opposing units try to occupy the same tile they engage in a combat round. During combat the two mobile suits must battle one another on a limited 2D side-scrolling map until either one is destroyed, or until the 60 second time limit runs out. Player's attempt to hit their opponent by shooting at them or using their melee weapons to reduce the opponents HP. If a player's mobile suit runs out of HP it is destroyed, and the winner will occupy the contested tile on the main map. If time runs out, the player with the most energy gets to stay on the tile, and the loser's mobile suit is ejected to another adjacent tile. During the battle, items may float on to the screen, such as extra HP restoring food or stopwatches which effect the remaining battle time. If you are able to occupy the enemy base you battle their commander. Since there is a skill component to battles, have a resource advantage doesn't necessarily mean that a player will be unstoppabble. If a team is able to occupy the enemy's base they will destroy their gachapon machine, defeating them and winning the game.