History VideoGame / MetalSlugInfinity

* AnnouncerChatter: Sophia Greenville, voiced by Creator/MinaTominaga [[note]]Who also voiced Sophia in ''Metal Slug'''s Combat School mode for the Japanese UsefulNotes/PlayStation and Saturn versions[[/note]], talked in the background. Her voice lines were entirely in Japanese, but there were no subtitles.

* SomethingCompletelyDifferent: The Arcade mode had the player directly control one unit using virtual buttons.

''Metal Slug Infinity'' was a mobile IdleGame TowerDefense game developed by ekkorr and released in 2019. It is a spin-off of the ''VideoGame/MetalSlug'' series.

''Metal Slug Infinity'' is a mobile IdleGame TowerDefense game developed by ekkorr and released in 2019. It is a spin-off of the ''VideoGame/MetalSlug'' series.

Gameplay is similar to SNK's previous two games (''VideoGame/MetalSlugDefense'' and ''VideoGame/MetalSlugAttack'') where a team of units attack their enemy base while protecting their own. However, most of the battle is done in the background, and the player only manages the various currencies to level up their units.

!!''Metal Slug Infinity'' provides examples of:
* AllegedlyFreeGame: Gems are the game's premium currency and are used to promote units, Slugs, War Books, and Artifacts to stronger levels. Unlike ''Metal Slug Defense'' and ''Metal Slug Attack'', ''Metal Slug Infinity'' is more generous in giving Gems of decent quantities per day. Likewise, the player is easily able to earn Units and Slugs through the various rewards, events, and submodes.
* AnnouncerChatter: Sophia Greenville, voiced by Creator/MinaTominaga [[note]]Who also voiced Sophia in ''Metal Slug'''s Combat School mode for the Japanese UsefulNotes/PlayStation and Saturn versions[[/note]], talks in the background. Her voice lines are entirely in Japanese, but there are no subtitles.
* ArtShiftedSequel: Instead of using pixel sprites, ''Infinity'' uses a stylized chibi look that fully resembles the arcade graphics. This is because the units can aim at various angles and thus using pixels would make the animations harder to draw.
* AttackAnimal: The animal Slugs from the main games all make an appearance in this game. The mutated enemy creatures are also playable.
* {{Backtracking}}: One of the main gameplay element is called Returning. Should the player be overwhelmed, they can return a couple of thousand stages back. While their gold, soldier levels, and Gold Mines are reset, the player earns medals to boost the unit's elemental type mastery, gold rates are increased, and is rewarded with various prizes.
* CarFu: Once a Slug runs out of fuel or health, the vehicle starts to flash red. The player can tap the Slug to make it ram onto the closest enemy unit and explode. Animal Slugs simply slam the closest enemies and run back to base.
* EndlessGame: The main game continues forever without an ending in sight.
* EnemyMine: The player can deploy Rebel Army, Amadeus Syndicate, Ptolemaic Army, and other enemy independent units and vehicles.
* EvilDoppelganger: Once reaching stage 10,000, the heroic Regular Army troops join their enemies in attacking the player.
* ExcusePlot: The game begins with everyone accidentally traveling to another dimension. Nothing happens after that, and it is just them fighting their way out.
* FastForwardMechanic: Units with the Stimpack ability increases the chance to speed up the battle. Others have the ability to skip a number of stages. This is useful when Returning as the units will quickly travel to the maximum stage they were at and can skip boss stages at the right moment.
* InstantArmor: Some units eventually produce a temporary barrier that grants immunity of a specific elemental type. Enemy units have a permanent barrier in their disposal.
* MultiMookMelee: The Battle of Rift stages has various enemy units bombard from both sides of the arena. As the battle progresses, the enemy units and their projectiles become bigger in size.
* NoSell: The three factions have an immunity to a certain effect.
** Regular Army units are immune to knockback.
** Rebel Army units are immune to shock.
** Another Force units are immune to stun.
* OneSizeFitsAll: Everyone can ride any Slug no matter their size. Large units either shrink in size or are crammed inside the cockpit.
* OriginalGeneration: Like ''Attack'', ''Infinity'' has new units and Slugs created for this game and are marked with the "MSI Origin" label in their description. The exception is the Turtle Slug who was an unused ''Metal Slug 3'' concept.
* PromotedToPlayable: Cynthia Hartnett, a combat instructor in ''Metal Slug 7/XX'', fights in this game using a Big Rocket Launcher.
* SomethingCompletelyDifferent: The Arcade mode has the player directly control one unit using virtual buttons.
* SpeedySnail: The Big Snail is quite fast and will spin to get closer to the enemy.

* TimedMission: Most submodes has the units clear the main target under a time limit. The main game has certain boss stages that has to be cleared under 300 seconds.
* VillainTeamUp: The Rebel Army also consists of Amadeus Syndicate and Ptolemaic Army units.
* WarpWhistle: The Slugs have the ability to warp a number of stages ahead. This is useful when the player is returned a thousand stages back. The Slugs cannot warp in boss stages nor any stage past the previous stage breakthrough.

* AnnouncerChatter: Sophia Greenville, voiced by Creator/MinaTominaga [[note]]Who also voiced Sophia in ''Metal Slug'''s Combat School mode for the Japanese PlayStation and Saturn versions[[/note]], talks in the background. Her voice lines are entirely in Japanese, but there are no subtitles.