diff --git a/examples/gno.land/r/demo/boards2/flag.gno b/examples/gno.land/r/demo/boards2/flag.gno
index aa4ef00b0cd..e5744211ddf 100644
--- a/examples/gno.land/r/demo/boards2/flag.gno
+++ b/examples/gno.land/r/demo/boards2/flag.gno
@@ -5,7 +5,7 @@ import (
 	"strconv"
 )
 
-var flagThreshold = 3
+const flagThreshold = 1
 
 type Flag struct {
 	User   std.Address
diff --git a/examples/gno.land/r/demo/boards2/public.gno b/examples/gno.land/r/demo/boards2/public.gno
index 62edded9003..c641c573ffe 100644
--- a/examples/gno.land/r/demo/boards2/public.gno
+++ b/examples/gno.land/r/demo/boards2/public.gno
@@ -76,9 +76,10 @@ func CreateReply(bid BoardID, threadID, replyID PostID, body string) PostID {
 	board := mustGetBoard(bid)
 	thread := mustGetThread(board, threadID)
 
+	assertThreadVisible(thread)
+
 	// TODO: Assert thread is not locked
 	// TODO: Assert that caller is a board member (when board type is invite only)
-
 	var reply *Post
 	if replyID == threadID {
 		// When the parent reply is the thread just add reply to thread
@@ -86,6 +87,8 @@ func CreateReply(bid BoardID, threadID, replyID PostID, body string) PostID {
 	} else {
 		// Try to get parent reply and add a new child reply
 		post := mustGetReply(thread, replyID)
+		assertThreadVisible(thread)
+
 		reply = post.AddReply(caller, body)
 	}
 	return reply.id
@@ -260,3 +263,9 @@ func assertReplyExists(thread *Post, replyID PostID) {
 		panic("reply not found: " + replyID.String())
 	}
 }
+
+func assertThreadVisible(thread *Post) {
+	if thread.Hidden() {
+		panic("thread with ID: " + thread.GetPostID().String() + " was hidden")
+	}
+}
diff --git a/examples/gno.land/r/demo/boards2/z_2_a_filetest.gno b/examples/gno.land/r/demo/boards2/z_2_a_filetest.gno
new file mode 100644
index 00000000000..626438d0c0a
--- /dev/null
+++ b/examples/gno.land/r/demo/boards2/z_2_a_filetest.gno
@@ -0,0 +1,23 @@
+package main
+
+import (
+	"std"
+
+	"gno.land/r/demo/boards2"
+)
+
+const owner = std.Address("g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5") // @test1
+
+func init() {
+	std.TestSetOrigCaller(owner)
+}
+
+func main() {
+	bid := boards2.CreateBoard("test1")
+	pid := boards2.CreateThread(bid, "thread", "thread")
+	boards2.FlagThread(bid, pid, "reason")
+	rid := boards2.CreateReply(bid, pid, pid, "reply")
+}
+
+// Error:
+// thread with ID: 1 was hidden
diff --git a/examples/gno.land/r/demo/boards2/z_2_b_filetest.gno b/examples/gno.land/r/demo/boards2/z_2_b_filetest.gno
new file mode 100644
index 00000000000..a4f4d403c8c
--- /dev/null
+++ b/examples/gno.land/r/demo/boards2/z_2_b_filetest.gno
@@ -0,0 +1,26 @@
+package main
+
+import (
+	"std"
+
+	"gno.land/r/demo/boards2"
+)
+
+const owner = std.Address("g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5") // @test1
+
+func init() {
+	std.TestSetOrigCaller(owner)
+}
+
+func main() {
+	// ensure that nested replies denied if root thread is hidden.
+	bid := boards2.CreateBoard("test1")
+	pid := boards2.CreateThread(bid, "thread", "thread")
+	rid := boards2.CreateReply(bid, pid, pid, "reply1")
+
+	boards2.FlagThread(bid, pid, "reason")
+	_ = boards2.CreateReply(bid, pid, rid, "reply1.1")
+}
+
+// Error:
+// thread with ID: 1 was hidden
diff --git a/examples/gno.land/r/demo/boards2/z_2_c_filetest.gno b/examples/gno.land/r/demo/boards2/z_2_c_filetest.gno
new file mode 100644
index 00000000000..c5ef6a5e6ed
--- /dev/null
+++ b/examples/gno.land/r/demo/boards2/z_2_c_filetest.gno
@@ -0,0 +1,26 @@
+package main
+
+import (
+	"std"
+
+	"gno.land/r/demo/boards2"
+)
+
+const owner = std.Address("g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5") // @test1
+
+func init() {
+	std.TestSetOrigCaller(owner)
+}
+
+func main() {
+	// ensure that nested replies denied if root thread is hidden.
+	bid := boards2.CreateBoard("test1")
+	pid := boards2.CreateThread(bid, "thread", "thread")
+	rid := boards2.CreateReply(bid, pid, pid, "reply1")
+
+	boards2.FlagReply(bid, pid, rid, "reason")
+	_ = boards2.CreateReply(bid, pid, rid, "reply1.1")
+}
+
+// Error:
+// thread with ID: 2 was hidden