Metal Slug XX

Metal Slug XX(Metal Slug Double X)
Year	2009
Developer	SNK Playmore
Publisher	SNK Playmore, Atlus
Genre	Platformer, Run N' Gun
Platforms	PSP, PSVita, Xbox 360, Xbox One, Xbox Series X/S, PlayStation 4, PlayStation 5, Steam

Metal Slug XX (reads Metal Slug Double X) is an enhanced modification of Metal Slug 7.

Metal Slug XX was released in December 2009 for the PlayStation Portable and Xbox Live Arcade with new content. These are backwards compatible with the PlayStation Vita, Xbox One, and Xbox Series X|S consoles, respectively.

A remastered version for the PlayStation 4 was released on May 29, 2018 and for Steam on January 31, 2019; the former is also compatible with the PlayStation 5.

New Features and Differences

Presentation

• The screen and graphics are not re-dimensioned to fit the screen. Additionally, the player can select the aspect ratio of the screen:
  • 4:3 (Regular aspect ratio with designed borders at left and right of the screen)
  • Wide (Fullscreen with the graphics stretched)
  • Clear (Classic Neo Geo aspect ratio)
• Rebel Infantry reuse their sound effects from Metal Slug 6 (except for Xbox versions).
• Mission 1 and Mission 6 take place in different times of day.
• A new announcer; bits and pieces of the previous announcers can be heard.

Gameplay

• Old enemies reappear again such as the Mars People and the Hunters.
• Change in items, Slugs, and enemy placement. The Ostrich Slug is added in this version.
• Infinite continues to all difficulties.
• Reintrodution of multiplayer mode by using ad hoc and online services. Unlike previous games, there is no drop-in multiplayer.
• Implementation of Hidden Routes:
  • Mission 1
    • Hunter Hideaway: There should be a pitfall/hole before the Di-Cokka and the DANGER barrel. Go there and fight the Hunters.
  • Mission 5:
    • Deeper Ruins: When reaching the end of the second part of the stage, it says GO right. Instead, go left until finding a Warp Base. Get in the Base and fight UFOs and tons of soldiers.
    • Mars People Hallway: Just like the previous entrance but do not go in the Base. Jump over it. Hordes of Mars People are fought there.
• Altered challenges and ranking table in the Combat School mode. The Item Collection challenges are replaced by the returning Survival challenge and Super Devil rank. Players can switch characters without quitting back to the challenge list.

Leona Heidern

Leona Heidern is a downloadable character (costs $0.99). She has several gameplay benefits:

• Her Special Action is the Moon Slasher. It can tear down enemies and machinery with higher damage than grenades. It can also nullify projectiles.
• Vehicle Slugs' health is increased from three to four hits.
• 20% more ammo on any weapon crate.
• 20% more grenades/firebomb. Leona's grenades are her Earring Bombs.
• Leona keeps her weapons upon death. She loses them when continuing.

Xbox Versions Exclusives

• Achievements (12)
• Sound Adjustments:

Sound	Xbox Versions	PlayStation/Steam Versions
Leona Death
"Final Misson"

• Leona uses a unique death cry rather than using her old King Of Fighters defeat sound.
• The new announcer shouts "Final Mission Start" instead of the Metal Slug 6 announcer.
• The Rebels use their old Neo Geo yells.

PlayStation 4/PS5/Steam Exclusives

• Leona Heidern available from the get-go (no purchase required).
• 4K and 1080p resolution. The characters in the menu screen have been redrawn.
• New borders for the Clear and 4:3 aspect ratios.
• Scanlines to simulate CRT and Arcade screens.
• PlayStation trophy support (30 including a Platinum).
• Steam achievements (34)

Weapon Ammo Breakdown

Weapon	Beginner				Normal/Hard
	Others	Fio	Ralf	Leona	Others	Fio	Ralf	Leona
Heavy Machine Gun	∞	∞	∞	∞	200	300	100	240
Rocket Launcher	60	90	30	72	30	45	15	36
Shotgun	60	90	30	72	30	45	15	36
Flame Shot	60	90	30	72	30	45	15	36
Laser Gun	400	600	200	480	200	300	100	240
Enemy Chaser	80	120	40	96	40	60	20	48
Iron Lizard	60	90	30	72	30	45	15	36
Drop Shot	60	90	30	72	30	45	5	36
Super Grenade	40	60	20	48	20	30	10	24
Two Machine Guns	600	900	300	720	300	450	150	360
Zantetsu Sword	20	30	10	24	10	15	5	12
Thunder Shot	40	60	20	48	20	30	10	24

Default Controls

All versions include auto-fire (off by default) and allow button combinations to be set to a single button.

On-Foot

Action	PSP/Vita	Xbox 360/One	PS4
Shoot	Square	X	Square
Jump	X	A	X
Grenade	Circle	B	Circle
Change Weapon	R	RB	R1
Special Melee Attack	L + Square	RT LB + X	R2 L1 + Square
Throw Weapon	L + Circle	LT LB + B	L2 L1 + Circle
Special Action	Up + L + Square	Y Up + LB + X	Triangle Up + L1 + Square

Slug

Action	PSP/Vita	Xbox 360/One	PS4
Shoot	Square	X	Square
Jump	X	A	X
Exit Slug	Down + X	Down + A	Down + X
Cannon	Circle	B	Circle
Grenade	Down + Circle	Down + B	Down + Circle
Frontal Attack	L	LB X + A*	L1

* This button combination is turned off by default.

Trivia

• Metal Slug XX is the third installment in the series to increase the number of playable characters, from six to seven with the addition of Leona.
• Metal Slug XX is the first game since Metal Slug: 2nd Mission where the game's announcer shouts the game's title.
• Using Leona (as well as most PSP downloadable content) in the PlayStation Vita requires purchasing the DLC in the PS store's website and using a PS3 to download and transfer the data to the Vita via cable.
• The snowman is the only transformation to return in this game after its absence from the gameplay of Metal Slug 6, thus marking the first time characters from The King of Fighters series can access to this element.

Screenshots

Metal Slug Double X Title

Taking a secret route in the first mission

Using the Slug Armor in the third mission

Using the Ostrich Slug in the fourth mission

Playing with Leona

Mission 1 Alternate Route Entrance

Mission 5 Alternate Entrance 1

Mission 5 Alternate Entrance 2

Covers

PSP Cover