Legacy concept page

What Is a Pass-Through Mod?

A way to borrow one system from another game without replacing the base game’s identity.

A pass-through mod keeps one game in charge of its input, camera, save flow, and primary progression, then passes a focused mechanic from another game through that stable frame. The imported system might be a shield rule, a building loop, a wanted meter, a traversal tool, or a different kind of mission pressure.

The phrase is useful because it sets a boundary. You are not asking an AI assistant to reproduce two complete commercial games. You are designing a small test that can answer whether one system creates better decisions inside the other game’s loop.

Continue with the 101 index

Start with what game merging means, then compare the public tools in the Melty and Universal Modder GitHub sections.

Examples

See the idea in a real combination

Merge guides

DOOM + Skyrim

DOOM and Skyrim sit at opposite ends of combat pacing. DOOM rewards constant movement, weapon switching, and aggressive resource loops, while Skyrim builds tension through exploration, dialogue, inventory decisions, and deliberate melee encounters. A thoughtful merge uses Skyrim's quest structure and fantasy geography as the wrapper, then brings in DOOM's arena tempo for selected encounters. The player might follow a faction quest through a ruin, trigger a sealed combat room, and use a small arsenal that refills through risky close-range actions. Outside those rooms, the game can breathe with reading, navigation, and character choice. This split makes the two identities reinforce each other: Skyrim supplies stakes and context, while DOOM supplies a sharp combat grammar. The target is a dark fantasy shooter-RPG rhythm, not a random collection of demons in a medieval map.

doom skyrim mod →

Merge guides

Super Mario 64 + Halo

Super Mario 64 and Halo can meet in a focused movement-and-combat experiment. Mario 64 supplies expressive jumps, readable stars, and compact stages with strong spatial landmarks. Halo contributes shield behavior, projectile combat, enemy formations, and the fantasy of a tactical arena. The most playable version keeps Mario's movement as the foundation: a player can triple-jump across a courtyard, then use a small ranged tool to disable a shielded enemy guarding a star route. Combat should be light enough that jumping remains the main verb, not a slow military simulator pasted into a platformer. Reframe weapons as temporary pickups and keep missions about reaching, routing, and improvising. That creates a pass-through mod with a clear identity: platforming levels that borrow Halo's combat rhythm in short bursts.

mario 64 halo mod →

Merge guides

Modern Warfare 2 + Skate 3 + Minecraft

The MW2, Skate 3, and Minecraft combination is best treated as a three-layer challenge rather than a literal port. Modern Warfare 2 suggests objective pressure and squad communication, Skate 3 suggests momentum, balance, and playful traversal, and Minecraft offers a modular world where players can construct routes and safe zones. A viable prototype can make a block-built training park with a few timed objectives: reach a checkpoint by skating, place temporary cover, and complete a short extraction task. The tone should be arcade-like, with original environments and a small set of verbs. Minecraft supplies persistence and construction, Skate 3 supplies movement expression, and the military layer supplies mission structure. Keeping the three systems in separate phases prevents the project from becoming a collision of unrelated menus and physics models.

modern warfare 2 skate 3 minecraft mod →