Once you’ve beaten the game and watched the credits, there is one more level you can play. It’s a short aircraft/hostage scenario that isn’t related to the main storyline.

There are many glitches in Call of Duty 4, near to all of them are found by using the "old school" match type. A match type that pays homage to the FPS games of yesteryear, allowing higher than average jumping, more health, and map controlled weapon spawns.

Unlock Arcade Mode by completing CoD4 on any difficulty level. This gameplay mode challenges the player to accumulate points while playing through the campaign.

The cheat menu is unlocked by completing CoD4 on any difficulty level. The Cheat menu can be found during gameplay in the options menu.

Cheats are unlocked by collecting enemy intel, which look like laptop computers, that are hidden throughout the campaign. Cheats are enabled using the cheat menu.

Warning: Using cheats disables Achievements.

Turns all gameplay turns black and white.

Inverses all of the colors of the game.

Dramatically increases the game’s contrast. Dark gets darker. Lights get lighter.

Gameplay goes black-and-white, dust and scratches fill the screen, game speed is doubled, and the music becomes piano music.

After your frag grenades explodes, four more explode.

When you kill enemies, they explode into a bunch of old tires!

By using the melee button, you can change the game to slow-mo and play at half-speed.

Unlimited ammo. No reloading needed. Doesn’t work with C4 and Claymores.