Added hint for high threat level sector

core/assets/bundles/bundle.properties

@@ -1395,6 +1395,7 @@ hint.generator = \uf879 [accent]Combustion Generators[] burn coal and transmit p
 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 \uf835 [accent]Graphite[] \uf861Duo/\uf859Salvo ammunition to take Guardians down.
 hint.coreUpgrade = Cores can be upgraded by [accent]placing higher-tier cores over them[].\n\nPlace a  [accent]Foundation[] core over the  [accent]Shard[] core. Make sure it is free from nearby obstructions.
 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.
 hint.coreIncinerate = After the core is filled to capacity with an item, any extra items of that type it receives will be [accent]incinerated[].
 hint.coopCampaign = When playing the [accent]co-op campaign[], items that are produced in the current map will also be sent [accent]to your local sectors[].\n\nAny new research done by the host also carries over.
 

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

@@ -181,6 +181,11 @@ public class HintsFragment extends Fragment{
             && SectorPresets.frozenForest.unlocked()
             && SectorPresets.frozenForest.sector.save == null,
             () -> state.isCampaign() && state.getSector().preset == SectorPresets.frozenForest),
+        presetDifficulty(() -> state.isCampaign()
+            && state.getSector().preset == null
+            && state.getSector().threat >= 0.5f
+            && !SectorPresets.tarFields.sector.isCaptured(), //appear only when the player hasn't progressed much in the game yet
+            () -> state.isCampaign() && state.getSector().preset != null),
         coreIncinerate(() -> state.isCampaign() && state.rules.defaultTeam.core() != null && state.rules.defaultTeam.core().items.get(Items.copper) >= state.rules.defaultTeam.core().storageCapacity - 10, () -> false),
         coopCampaign(() -> net.client() && state.isCampaign() && SectorPresets.groundZero.sector.hasBase(), () -> false),
         ;