The Shadow Rifle is one of the most powerful weapons in the game, being capable of defeating most enemies with a single shot (one exception is Artificial Chaos, which will take two or more shots due to having multiple-tiers of target-able areas). It can also destroy a Black Arm's Tank with fully powered shields in the Lethal Highway level with a mere thirteen shots.
To unlock it, the player must complete all endings in Shadow the Hedgehog, go to "Last Story", complete The Last Way, and defeat Devil Doom. After the credits are over, the Shadow Rifle will be unlocked. It holds 20 rounds and has high range.
- The Shadow Rifle is the only secret weapon that cannot reach a Level 2 upgrade, since all but the Last Story have two endings.
- It is considered one of the most effective weapons in the game, though the Omochao Gun is sometimes considered more effective in certain situations. The shots, however, are not all one-hit K.O.'s, as certain "enemies" such as ships take two or three shots, while certain Black Oaks are completely immune.
- On the left and right sides of the handle, the symbol of the Black Arms is visible.