Fixed #2901 / Fixed #2903

core/src/mindustry/world/Block.java

@@ -193,6 +193,8 @@ public class Block extends UnlockableContent{
     public BuildPlaceability buildPlaceability = BuildPlaceability.always;
     /** Multiplier for speed of building this block. */
     public float buildCostMultiplier = 1f;
+    /** Multiplier for cost of research in tech tree. */
+    public float researchCostMultiplier = 1;
     /** Whether this block has instant transfer.*/
     public boolean instantTransfer = false;
     /** Whether you can rotate this block with Keybind rotateplaced + Scroll Wheel. */
@@ -619,7 +621,7 @@ public class Block extends UnlockableContent{
     public ItemStack[] researchRequirements(){
         ItemStack[] out = new ItemStack[requirements.length];
         for(int i = 0; i < out.length; i++){
-            int quantity = 40 + Mathf.round(Mathf.pow(requirements[i].amount, 1.25f) * 20, 10);
+            int quantity = 40 + Mathf.round(Mathf.pow(requirements[i].amount, 1.25f) * 20 * researchCostMultiplier, 10);
 
             out[i] = new ItemStack(requirements[i].item, UI.roundAmount(quantity));
         }