Metal Slug ports on steam aren't the best, as you may have noticed theres a substantial amount of input lag when using a controller, however for whatever reason this input lag doesnt exist or is substantially reduced when using a keyboard, this guide will exploit that fact from the spaghetti code

keep in mind, this fix is meant for singleplayer, i have no idea how this will behave in coop

1 - you need an Xbox controller, or just a controller steam recognizes as an Xbox controller

2 - go to the game properties on steam and enable the Steam Input option on the Controller section



3 - inside the game, go to the control options and make sure the keyboard configuration is as follows (the autofire option doesn't matter, enable it if you want)

just open this link and steam will do the rest, its my steam input controller configuration for an Xbox controller, it will take your controller commands and send em to the game as if they came from the keyboard:

steam://controllerconfig/366250/2565409448

X - fire
A - jumping
B - grenade