diff --git a/src/cli.rs b/src/cli.rs
index f97b72a..c87c934 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1225,7 +1225,15 @@ fn cmd_list(
         "gsmg" => gsmg::all().collect(),
         "hash_collision" | "peter_todd" => hash_collision::all().collect(),
         "zden" => zden::all().collect(),
-        _ => boha::all().collect(),
+        "all" => boha::all().collect(),
+        _ => {
+            eprintln!(
+                "{} Unknown collection: {}. Use: arweave, b1000, ballet, bitaps, bitimage, gsmg, hash_collision (peter_todd), zden, all",
+                "Error:".red().bold(),
+                collection
+            );
+            std::process::exit(1);
+        }
     };
 
     let filtered: Vec<_> = puzzles
diff --git a/tests/cli.rs b/tests/cli.rs
index 078a45f..ddd9e3e 100644
--- a/tests/cli.rs
+++ b/tests/cli.rs
@@ -164,6 +164,16 @@ mod list {
             .stdout(predicate::str::contains("\"id\": \"gsmg\""))
             .stdout(predicate::str::contains("\"address\":"));
     }
+
+    #[test]
+    fn unknown_collection_error() {
+        boha()
+            .args(["list", "unknown"])
+            .assert()
+            .failure()
+            .stderr(predicate::str::contains("Error:"))
+            .stderr(predicate::str::contains("Unknown collection"));
+    }
 }
 
 mod show {