Contra Force is a run-and-gun-style shoot-'em-up video game released by Konami for the Nintendo Entertainment System in 1992 in North America only. It is a spin-off of the Contra series and the third game in the series released for the NES (following the home versions of the original Contra and Super C). In contrast to previous Contra titles, which featured sci-fi elements, Contra Force centers around a modern task force who must fight human terrorists instead. The game was originally scheduled to be released as an unrelated game in Japan titled Arc Hound (アークハウンド). The Japanese version was canceled and instead Konami localized the game for a North American release as a Contra spinoff.

Contra Force begins with the player being asked to choose between one of four characters. In addition to Burns, the team's leader, the player can also choose between Iron, a heavy weapons expert; Smith, a sharpshooter; and Beans, a demolitions expert. Each character differ from each other, not just in what weapons they wield, but also in their speed and jumping ability.

The game consists of five stages: the odd-numbered stages (1, 3, and 5) are played from the standard side-view perspective, while the even-numbered stages (2 and 4) are played from an overhead perspective (similar to the ones in Super Contra and Operation C). The objective is as simple as getting to the end of each stage, fighting every enemy who gets in the way, before confronting the boss awaiting at the end.

The controls are similar to previous Contra games. At the side-view stages the player can walk left or right, as well as crouch and jump, whereas in the top-view stages the player can move in eight directions (but cannot jump nor crouch). Shooting is possible at any of the eight directions depending on the context. Instead of the instant power-ups from previous Contra games, the player has a power selection meter similar to the Gradius series which shows what power-ups the player can obtain. The player must pick up briefcase-shaped power-ups, which are hidden within the destroyable environment of each stage, to move the cursor on the indicator by one increment. When the cursor is on the power-up the player wants to obtain, the player can confirm their selection with the select button. The items on the indicators includes a standard-issue pistol for every character, two character-specific weapons, a turbo fire power-up that increases the number of bullets on-screen, and a rolling attack that keeps the character invulnerable to enemy fire while in mid-air.

The player can pause the game and go to a sub-menu where they can change their current character. At the sub-menu, the player can assign another character to a second player or call forth a computer-controlled partner. The player can assign from one of six possible strategies to their partner ranging between defensive and offensive. The partner character will then appear for five seconds to assist the player before disappearing. When the partner is gone, the player can summon him again from the sub-menu. Each character has only three lives. If a single player loses all of their lives as one character, the game will end. The player can use the sub-menu to switch to another character that still has extra lives before that happens. In the 2-player mode, if one player loses all of their lives, they can be assigned another character, but the character that lost all of his lives will become unusable. Unlimited chances to continue are provided.