diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearch.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearch.kt
index 4181a4705..8846050e8 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearch.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearch.kt
@@ -141,8 +141,8 @@ abstract class AndroidResearch(val type: AndroidResearchType<*>, val capability:
 		isResearched = nbt.getBoolean("researched")
 	}
 
-	inline val prerequisites get() = type.definedPrerequisites
+	inline val prerequisites get() = type.flatPrerequisites
 	inline val unlocks get() = type.flatUnlocks
-	inline val blockedBy get() = type.definedBlockedBy
+	inline val blockedBy get() = type.flatBlockedBy
 	inline val blocking get() = type.flatBlocking
 }
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearchBuilder.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearchBuilder.kt
index c81622a19..43c6b481d 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearchBuilder.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearchBuilder.kt
@@ -354,7 +354,7 @@ class AndroidResearchBuilder(
 						))
 					}
 
-					for (value in this.type.definedBlockedBy) {
+					for (value in this.type.flatBlockedBy) {
 						builder.add(TranslatableComponent("android_research.status.blocked_by", capability.getResearch(value).screenTooltipHeader).withStyle(ChatFormatting.DARK_RED))
 					}
 
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearchType.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearchType.kt
index 8ef214791..564f592d5 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearchType.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/android/AndroidResearchType.kt
@@ -132,7 +132,7 @@ open class AndroidResearchType<R : AndroidResearch>(
 	/**
 	 * Prerequisites as-is.
 	 *
-	 * Please avoid having more than one prerequisite as this case don't have proper research tree
+	 * Please avoid having more than one prerequisite, as this case doesn't have proper research tree
 	 * rendering code (yet).
 	 */
 	open val definedPrerequisites: List<AndroidResearchType<*>> get() = emptyList()
@@ -217,6 +217,42 @@ open class AndroidResearchType<R : AndroidResearch>(
 		ListSet(list.build())
 	}
 
+	/**
+	 * Flat list of research blocking this research.
+	 *
+	 * This list won't contain any research blocked by this' research parents.
+	 *
+	 * E.g.
+	 *
+	 * * C depends on B
+	 * * B is blocked by A
+	 * * C is blocked by A
+	 *
+	 * Both B and C are blocked by A, but C requires B, so C's [flatBlockedBy] will not contain A, but B's will.
+	 *
+	 * Returns list which also doubles as set (for contains method).
+	 */
+	val flatBlockedBy: List<AndroidResearchType<*>> by lazy {
+		val list = ImmutableList.builder<AndroidResearchType<*>>()
+
+		for (blocker in definedBlockedBy) {
+			var hit = false
+
+			for (research in allPrerequisites) {
+				if (blocker in research.flatBlockedBy) {
+					hit = true
+					break
+				}
+			}
+
+			if (!hit) {
+				list.add(blocker)
+			}
+		}
+
+		ListSet(list.build())
+	}
+
 	/**
 	 * All research directly unlocked by this research.
 	 *