Core zone tutorial hint

core/assets/bundles/bundle.properties

@@ -2130,6 +2130,7 @@ hint.waveFire = [accent]Wave[] turrets with water as ammunition will automatical
 hint.generator = :combustion-generator: [accent]Combustion Generators[] burn coal and transmit power to adjacent blocks.\n\nPower transmission range can be extended with :power-node: [accent]Power Nodes[].
 hint.guardian = [accent]Guardian[] units are armored. Weak ammo such as [accent]Copper[] and [accent]Lead[] is [scarlet]not effective[].\n\nUse higher tier turrets or :graphite: [accent]Graphite[] :duo:Duo/:salvo:Salvo ammunition to take Guardians down.
 hint.coreUpgrade = Cores can be upgraded by [accent]placing higher-tier cores over them[].\n\nPlace a :core-foundation: [accent]Foundation[] core over the :core-shard: [accent]Shard[] core. Make sure it is free from nearby obstructions.
+hint.serpuloCoreZone = Additional cores may be constructed on :core-zone: [accent]Core Zone[] tiles.
 hint.cannotUpgrade = A [red]:tree:[] icon over a payload unit indicates that its upgraded version is not researched yet.\n\nUnit upgrades must be researched in the [accent]:tree: tech tree[] before they can be produced in reconstructors.
 hint.presetLaunch = Gray [accent]landing zone sectors[], such as [accent]Frozen Forest[], can be launched to from anywhere. They do not require capture of nearby territory.\n\n[accent]Numbered sectors[], such as this one, are [accent]optional[].
 hint.presetDifficulty = This sector has a [scarlet]high enemy threat level[].\nLaunching to such sectors is [accent]not recommended[] without proper technology and preparation.

core/src/mindustry/core/Logic.java

@@ -172,6 +172,12 @@ public class Logic implements ApplicationListener{
             }
         });
 
+        Events.on(BlockDestroyEvent.class, e -> {
+            if(e.tile.team() != state.rules.defaultTeam){
+                state.stats.destroyedBlockCount.increment(e.tile.block());
+            }
+        });
+
         Events.on(UnitDestroyEvent.class, e -> {
             if(e.unit.team() != state.rules.defaultTeam){
                 state.stats.enemyUnitsDestroyed ++;

core/src/mindustry/game/EventType.java

@@ -555,7 +555,7 @@ public class EventType{
     }
 
     /** Called right before a block is destroyed.
-     * The tile entity of the tile in this event cannot be null when this happens.*/
+     * The building of the tile in this event cannot be null when this happens.*/
     public static class BlockDestroyEvent{
         public final Tile tile;
 

core/src/mindustry/game/GameStats.java

@@ -19,9 +19,19 @@ public class GameStats{
     public int unitsCreated;
     /** Record of blocks that have been placed by count. Used for objectives only. */
     public ObjectIntMap<Block> placedBlockCount = new ObjectIntMap<>();
+    /** Record of enemy blocks that have been destroyed (from any source) by count. */
+    public ObjectIntMap<Block> destroyedBlockCount = new ObjectIntMap<>();
     /**
      * Record of items that have entered the core through transport blocks. Used for objectives only.
      * This can easily be ""spoofed"" with unloaders, so don't use it for anything remotely important.
      * */
     public ObjectIntMap<Item> coreItemCount = new ObjectIntMap<>();
+
+    public int getPlaced(Block block){
+        return placedBlockCount.get(block, 0);
+    }
+
+    public int getDestroyed(Block block){
+        return destroyedBlockCount.get(block, 0);
+    }
 }

core/src/mindustry/ui/fragments/HintsFragment.java

@@ -196,6 +196,10 @@ public class HintsFragment{
             && state.rules.defaultTeam.core().block == Blocks.coreShard
             && state.rules.defaultTeam.core().items.has(Blocks.coreFoundation.requirements),
             () -> ui.hints.placedBlocks.contains(Blocks.coreFoundation)),
+        serpuloCoreZone(() -> state.isCampaign() && state.getPlanet() == Planets.serpulo && Vars.indexer.isBlockPresent(Blocks.coreZone) &&
+            (!state.rules.attackMode || state.stats.getDestroyed(Blocks.coreShard) + state.stats.getDestroyed(Blocks.coreFoundation) + state.stats.getDestroyed(Blocks.coreNucleus) > 0),
+            () -> state.rules.defaultTeam.cores().size > 1),
+
         presetLaunch(() -> state.isCampaign()
             && state.getSector().preset == null,
             () -> state.isCampaign() && state.getSector().preset == SectorPresets.frozenForest),