The Game Over Screen is a gameplay element that appears throughout most video games.
Main Article: Continue Screen
Whenever the player loses all of his/her 3 lives, he/she is given an option to continue within 10 seconds (20 in Metal Slug 6) as long as they have any credits left.
If the player has failed to continue after the 10 seconds timer has passed out, the screen will fade into the color of blood red along with a "Game Over" text in their Status screen then which leads to the actual infamous 'Game Over' screen. The game over screen also appears after the credits screen in some games of the series.
In some games, the player is given an option to continue or return to the main menu.
Game Over Screen
Prior to Metal Slug 5. When the player fails to continue after 10 seconds, they are led to the original "Game Over screen." Where a 'game over' text is drawn in a ground along with a military helmet on the top right.
Metal Slug 5
The game over screen in Metal Slug 5 is same as the previous ones, however the military helmet on the top right is missing. The missing helmet could be explained as the player's main enemies in the game are the Ptolemaic Army rather than the Rebels.
Metal Slug 6
When the player fails to continue after 20 seconds, they are led to Metal Slug 6's game over screen, where there are several rifles and bullets stacked over. A Mars People's skull can be seen also on the right side. After that the screen fades into the static-TV screen.
Metal Slug 7/XX
While the game over screen of Metal Slug 7/XX is much unique than its predecessors. Whenever the player fails to continue after the 10 seconds timer, the player is led to a horde of Rebel Infantries cheering up along with a few more minor enemies. Then the 'Game Over' text will appear roughly. The game over screen of the cheering rebels depends on which mission the player fails.
Metal Slug Advance
The game over screen in Metal Slug Advance is same as the original main series' one, but the "Game Over" text written on the ground is missing and the text "Mission Failed" will appear. Unlike in the other games, the player is given an option to continue or return to main menu during the screen.
Metal Slug Defense and Metal Slug Attack
If the player's base has been completely destroyed by the enemy's units, the words: "Mission Failed" will appear in a similar matter to Metal Slug Advance's. If this happens during Attack!, Extra Ops, or Another Story, the player is given a chance to restart by paying 30 medals which they are given a max AP. However, this doesn't happen in Battle or Team Battle, Guild Raid, and POW Rescue.