At a glance
Tani Oh is the end-encounter reference for Mission 3 of Metal Slug 1. 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.
Snowy climb and Rebel base
This mission begins with an upward climb in Käthehirt Valley. Allen O’Neil waits near the top; after him, the route passes through a Rebel base and reaches the forest encounter with Tani Oh.
The camera does not move back down during the climb: falling below the visible area is fatal. A large snowball also rolls down the upper ramp. Prioritise the next landing before chasing pickups.
Campaign reference: Metal Slug Wiki’s mission overview. Practice suggestions below are our own.
Make grenades deliberate
Try this focused practice plan during your run. These are optional goals to set yourself, not extra objectives or achievements awarded by the game.
Notice your grenade count when the mission begins.
Choose which difficult encounter is worth spending ammunition on.
Against Tani Oh, compare a deliberate short burst with spending every grenade immediately.
How do I reach Mission 3?
Progress through Mission 2 in Metal Slug 1 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.