Made PvP a selectable mode

core/assets/bundles/bundle.properties

@@ -423,6 +423,8 @@ mode.sandbox.description=infinite resources and no timer for waves.
 mode.custom.warning=Note that blocks unlocked in custom games are not carried over to sectors.\n\n[LIGHT_GRAY]In sandbox, only blocks unlocked with sector play can be used.
 mode.freebuild.name=freebuild
 mode.freebuild.description=limited resources and no timer for waves.
+mode.pvp.name=PvP
+mode.pvp.description=fight against other players locally.
 
 content.item.name=Items
 content.liquid.name=Liquids

core/src/io/anuke/mindustry/game/GameMode.java

@@ -28,7 +28,6 @@ public enum GameMode{
         showPads = true;
         disableWaves = true;
         isPvp = true;
-        hidden = true;
         enemyCoreBuildRadius = 600f;
         respawnTime = 60 * 10;
     }};