At a glance
Jupiter King is the end-encounter reference for Mission 3 of Metal Slug 3. It is followed by Mission 4.
Mission numbers refer to the original campaign order. Boss names follow the community mission reference; they are encounter identifiers, not official stage titles.
Sea approach and secret weapons factory
A scuba approach leads toward the Rebels’ hidden factory. Branches offer an underwater or factory route and an elevated bridge route. Rebel Armor appears in the factory path, while an Ostrich Slug is associated with the bridge; the routes meet before Jupiter King.
Different vehicles make the approaches play differently. The boiler-room area is a common late landmark, making it a useful point to compare how well each route prepared you.
Campaign reference: Metal Slug Wiki’s mission overview. Practice suggestions below are our own.
Arrive ready for the encounter
Try this focused practice plan during your run. These are optional goals to set yourself, not extra objectives or achievements awarded by the game.
Compare your weapon and ammunition when you arrive on successive attempts.
Choose which approach encounter deserves a grenade and which you can handle with movement.
At Jupiter King, leave room to respond before committing to a long attack.
How do I reach Mission 3?
Progress through Mission 2 in Metal Slug 3 to reach this mission. A new arcade run begins at Mission 1.
The Play button selects this title in the collection. It does not launch this specific mission, change the original game’s difficulty or unlock later stages. Use the guides below to read ahead while your campaign follows its normal order.
Can I return to Mission 3 later?
In a solo session, pause and use Save State after reaching the point you want to revisit. Open the same title in the same browser and use Load State to restore a compatible saved point. Saving again replaces the previous saved point for that title; a link to this guide does not include your save.
Manual continues include free credits. Automatic continues can be changed in Options & Controls → Gameplay. Neither option is a mission selector. Read the save and continue guide.
Controls for this run
These are Classic keyboard defaults; saved bindings take precedence. Touch uses movement plus A / FIRE, B / JUMP and C / BOMB. Arrange touch controls before a long session, or see all controls.