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The second instalment of SNK's wildly popular Metal Slug series! This game is a side-scroller which puts you in the boots of Marco, Tarma, Eri and Fio. Your mission: wiping out General Morden's. Searching for metal slug in All Roms Filter by letter. All # A; B; C; D; E; F; G; H; I; J; K; L; M; N; O; P; Q; R; S; T; U; V; W; X; Y; Z; Sorted.

This page details bugs of Metal Slug 2 (Neo Geo).

Metal Slug 2 is infamous for its poor performance on the original Neo Geo hardware (and accurate emulators), resulting in near-constant slowdown which makes the game crawl along at a pace unlike the rest of the series. While this is partly the result of a poorly optimized engine, there is also a bug in the main program's framerate-locking code, found in 241-1.p1 (MAME ROM naming). Metal Slug 2 is locked to a maximum of 30 frames per second, updating only on odd frames. The bug in question crops up when slowdown causes the game to consistently miss odd frames, since it will then wait a further two frames before updating. The result is that when the game should be dropping to 20 FPS, it instead drops to 15 FPS and when it should be dropping to 10FPS, it instead drops to 7.5 FPS. When genuinely dropping to framerates which don't cause the game to miss odd frames (such as 15 FPS), the issue is not seen.

trap15 (see source) documented the bug with the following pseudocode and created a patch which corrects this behavior: it does not make any further modifications to the engine, so the result is slowdown that occurs with the same frequency as the stock game, but with much-reduced severity.

The second Metal Slug game. Buggy enough to have the bugfix released as a separate game, Metal Slug X.

• 1Debug Menu

Debug Menu

おしながき

• メニューを　とじる（ＰＡＵＳＥしたまま） - Close the Menu (While Paused)
• ＳＥＴ　ＤＥＢＵＧ　ＤＩＰ
• ステージ　セレクト - Stage Select
• ＴＥＳＴ　ＳＴＡＧＥ
• サウンド　テスト - Sound Test
• ＣＯＬＯＲ　ＢＡＲ

It is worth noting this Debug Menu is shared by Metal Slug 2, X, 3, 4, and 5.

Metal Slug 4 Rom

To access the debug mode, open the game in Console Mode and set debug developer mode On at the Neo Geo boot up screen: this can be done via the Kawaks emulator, the Nebula emulator or using the Neo Geo UniBios.

Enter the game, and press COIN up twice during gameplay: after pausing, the debug menu will appear - with options to activate the debug dipswitches (which can be activated separately through other options using Kawaks) and even the ability to play on any regular level, and even some test levels not available in the actual game. There is also a Sound Test screen and Color Test screen.

SET DEBUG DIP

• ムテキ - Invincibility.
• ＶＩＥＷ　ＩＮＦＯＲＭＡＴＩＯＮ - View debug information.
• イツデモＰＡＵＳＥ - Allows to pause during score tally, cutscenes and credits.
• ＶＩＥＷ　ＧＥＯ　ＳＣＲＯＬＬ　Ａ - 1st plane check, shows the walkable ground, makes the foreground choppy as it scrolls when activated. May linger if not turned off properly.
• ＶＩＥＷ　ＧＥＯ　ＳＣＲＯＬＬ Ｂ - 2nd plane check, makes the background choppy as it scrolls when activated.
• ＶＩＥＷ　ＡＴＴＡＣＫ　ＲＥＣＴ - View attack hitbox.
• ＶＩＥＷ　ＢＯＤＹ　ＲＥＣＴ - View body hitbox.
• ムセイゲン　グレネード - Infinite grenades.
• ムセイゲン　ＰＯＷガン - Infinite ammunition.
• ＶＩＥＷ　ＰＡ　ポイント - A sprite of Satiko Suzuki with the wrong palette appears, showing the player's respawn point.
• Ｄボタン、テキ　ゼンメツ - Press D to destroy all on-screen enemies (no score bonuses).

• VIEW INFORMATION active, note the 'ZOMBIE'.

• VIEW GEO SCROLL A and VIEW ATTACK RECT active.

• VIEW BODY RECT and VIEW PA ポイント active.

Stage Select

Exactly what it says on the tin, allows you to warp to all stages and sections in the game. Worth noting there are no unused regular levels like in Metal Slug X, 3 and 5 in this game.

ステージ　セレクト - Stage Select

• １：（サバク）　コウサに　ふかれて - (Desert) Blowin' in the Sand
• ２：（イセキ）　かなしみ　モニュメント - (Ruins) Monument to Sadness
• ３：（レッシャ）　カゼの　マドリガル - (Train Car) The Wind's Madrigal
• ４：（ホンコン）　ブサンコウに　かえれ - (Hong Kong) Return to Busan
• ５：（タウン）　キス・インザ・ダーク - (Town) Kiss in the Dark
• ６：（キョクチ）　アイをイマ　しんじていたい - (North Pole) Right Now, I Want to Believe in Love

TEST STAGE

These strange test stages can be accessed with the above debug menu.

ステージ　セレクト - Stage Select.

• ＴＥＳＴ１　ｆｏｒ　ＡＮＤＹ　ＴＨＥ　ＷＩＺＡＲＤ contains the final area of Mission 6, with a Metal Slug, an Armour Piercer, a Shotgun, a Rocket Launcher, a Flame Shot, a Laser Gun, and a single soldier there.
• ＴＥＳＴ２　ｆｏｒ　ＹＡＭＡＤＡ is the beginning of Mission 4, with a Slug Flyer, three aliens and Rumi Aikawa there. A little further ahead are five prisoners who all give you Rocket Launchers, but strangely, after you pass the first building, everything explodes, and it acts as if you completed a mission.
• ＴＥＳＴ３　ｆｏｒ　ＹＯＫＯ－ＳＨＵ allows you to play around in the ending credits! If you hold down the jump, fire, or grenade button, the credits speed up.
• ＴＥＳＴ４　ｆｏｒ　ハマチャン　ＹＥＨ (Hama-chan YEH) appears to be exactly the same as Mission 5, except it claims to be Mission 1, you walk in instead of parachuting in and after beating the boss, it will act like having completed the game.
• ＴＥＳＴ５　ｆｏｒ　ＫＯＮＤＯＵ is an entirely empty version of Mission 1, with no background, oddly placed and missing pieces of the foreground, and other errors.
• ＴＥＳＴ６　ｆｏｒ　ＴＡＫＡＤＡ is also Mission 1, but this has a background and is entirely empty, other than Rumi Aikawa and a red helicopter appearing right at the start, and later on there’s an invincible truck carrying a Metal Slug.
• ＴＥＳＴ７　ｆｏｒ　ＮＡＫＡＴＵＫＡ is simply an empty version of the final part of Mission 6, but claims to be Mission 1.
• ＴＥＳＴ８　ｆｏｒ　ＴＡＧＵＣＨＩ is simply an empty Mission 3, other than a few planes you fight at the beginning.

• TEST1 for ANDY THE WIZARD

• TEST2 for YAMADA

• TEST3 for YOKO-SHU

• TEST4 for ハマチャン YEH

• TEST5 for KONDOU

• TEST6 for TAKADA

• TEST7 for NAKATUKA

• TEST8 for TAGUCHI

Sound Test

SFX and BGM test screen.

COLOR BAR

Color test screen.

Metal Slug 4 Neo Geo

Region-exclusive Messages

Depending on what BIOS is used, the message shown at startup will be different.

Neo Geo Rom Metal Slug 2 Download