Both base stages no longer have a time limit and feature a completely linear layout compared to the maze-like designs of their arcade counterparts. Stage 2 combines the first base stage and the subsequent battle in the core of the base into one level, whereas Stage 4 does the same for the second base and its core. Stage 1 (the jungle) starts similarly to its arcade counterpart, but the level is longer and there's an added segment where the player must jump over a couple of bottomless pits just before reaching the gate. The Contra 1 version consists of eight stages, which are structured a bit differently from the arcade game. When one player loses all of his lives, he is given the option to use the other player's stock to keep fighting. Instead, they are both depicted as shirtless commandos distinguished by the colors of their pants (blue pants for the first player and red pants for the second). The game can be played by up to two players, but due to the graphical limitations of the Contra 1, Bill and Lance lost their individualized character designs. This version was produced in-house by Konami and features several differences from the arcade release in order to better suit the Contra 1 hardware.

Contra was released for the Nintendo Entertainment System in North America on February 1988.

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