Star Fox is a rail shooter in a third-person and first-person 3D perspective. The player must navigate Fox's spacecraft, an Arwing, through environments while various enemies (spaceships, robots, creatures, etc.) attack them. Along the way, various power-ups are placed in the stage to help the player. The player receives a score at the end of each level based on how many enemies have been destroyed and how well the player has defended their teammates. At the end of each level there is a boss that the player must defeat before progressing to the next level.
Control of the Arwing includes thrusters and retro-rockets on the Arwing allowing the player to temporarily speed up or slow down. These can be used to maneuver around enemy attacks and other obstacles. Damage is incurred incrementally via loss of shield energy before the destruction of the craft. The game also has a small degree of locational damage detection: if the ship's wings clip against obstacles or the ground too much, they will break off, adversely affecting the craft's handling and removing the ability to upgrade weapons.
The difficulty in Star Fox is also set in a unique way. Most scrolling shooters, if they have selectable difficulty levels, allow the player to set the difficulty by choosing an option (e.g. "Easy," "Normal," and "Hard") at the beginning of the game. This option usually affects variables such as the number of lives a player has, the number of enemies encountered in the game, the speed of enemies, and so on. In contrast, at the beginning of Star Fox, the player is given a choice of one of three routes to take through the Lylat system. Each of these routes corresponds with a certain level of difficulty, but each route has its own series of unique levels. This gives Star Fox somewhat more replay value than other scrolling shooters that have a fixed series of levels each time the game is played. The three game paths all contain the planet Corneria (the first level) and Venom (the last level), but they each have different versions depending on the path taken.
In each level, the player is accompanied by three computer-controlled wingmen: Peppy Hare, Slippy Toad and Falco Lombardi. At certain pre-scripted points, one will fly into the player's view, often either chasing an enemy or being chased and asking for assistance. Ignoring a wingman's pleas will result in him taking damage, or even being shot down. They cannot be damaged by the player's own lasers (although they will complain if hit). Regardless of their survival, wingmen are not present during boss battles but rejoin the player before the next stage. A player may choose to help their wingmen when they ask for assistance, as doing so will allow them to engage some of the enemies not destroyed by the player, helping the player to succeed and additionally making it easier to achieve maximum score in a given level. Additional points are also granted at the end of each level depending on the health of each wingman. If a wingman gets shot down, he will not return for the rest of the game.
