diff --git a/Hydro/system_test/2/data/config.yaml b/Hydro/system_test/2/data/config.yaml
new file mode 100644
index 00000000..cfaaa073
--- /dev/null
+++ b/Hydro/system_test/2/data/config.yaml
@@ -0,0 +1,4 @@
+type: default
+
+time: 0.5s
+memory: 256m
\ No newline at end of file
diff --git a/Hydro/system_test/2/data/data1.ans b/Hydro/system_test/2/data/data1.ans
new file mode 100644
index 00000000..ac9cf09e
--- /dev/null
+++ b/Hydro/system_test/2/data/data1.ans
@@ -0,0 +1,3 @@
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+size 8
diff --git a/Hydro/system_test/2/data/data1.in b/Hydro/system_test/2/data/data1.in
new file mode 100644
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--- /dev/null
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diff --git a/Hydro/system_test/2/data/data2.ans b/Hydro/system_test/2/data/data2.ans
new file mode 100644
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--- /dev/null
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new file mode 100644
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--- /dev/null
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diff --git a/Hydro/system_test/2/data/data3.ans b/Hydro/system_test/2/data/data3.ans
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/2/data/data3.ans
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diff --git a/Hydro/system_test/2/data/data3.in b/Hydro/system_test/2/data/data3.in
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/2/data/data3.in
@@ -0,0 +1,3 @@
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diff --git a/Hydro/system_test/2/data/data4.ans b/Hydro/system_test/2/data/data4.ans
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/2/data/data4.ans
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diff --git a/Hydro/system_test/2/data/data4.in b/Hydro/system_test/2/data/data4.in
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/2/data/data4.in
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new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/2/data/data5.ans
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diff --git a/Hydro/system_test/2/data/data5.in b/Hydro/system_test/2/data/data5.in
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/2/data/data5.in
@@ -0,0 +1,3 @@
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diff --git a/Hydro/system_test/3/data/checker.cc b/Hydro/system_test/3/data/checker.cc
new file mode 100644
index 00000000..9dd866d2
--- /dev/null
+++ b/Hydro/system_test/3/data/checker.cc
@@ -0,0 +1,23 @@
+/**
+ * @file checker.cpp
+ * @author Macesuted (i@macesuted.moe)
+ * @date 2021-10-28
+ * 
+ * @copyright Copyright (c) 2021
+ * 
+ */
+
+#include <bits/stdc++.h>
+
+#include "testlib.h"
+
+using namespace std;
+
+int main(int argc, char* argv[]) {
+    registerTestlibCmd(argc, argv);
+    int n = inf.readInt();
+    for (int i = 1; i <= n; i++)
+        if (ouf.readInt() != i)
+            quitf(_wa, "Wrong Answer.");
+    quit(_ok, "Accepted!");
+}
diff --git a/Hydro/system_test/3/data/config.yaml b/Hydro/system_test/3/data/config.yaml
new file mode 100644
index 00000000..a5a235d0
--- /dev/null
+++ b/Hydro/system_test/3/data/config.yaml
@@ -0,0 +1,19 @@
+type: default
+
+time: 1s
+memory: 256m
+
+checker_type: testlib
+checker: checker.cc
+
+cases:
+    - input: data1.in
+    - input: data2.in
+    - input: data3.in
+    - input: data4.in
+    - input: data5.in
+    - input: data6.in
+    - input: data7.in
+    - input: data8.in
+    - input: data9.in
+    - input: data10.in
\ No newline at end of file
diff --git a/Hydro/system_test/3/data/data1.in b/Hydro/system_test/3/data/data1.in
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/3/data/data1.in
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+size 2
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new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/3/data/data10.in
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diff --git a/Hydro/system_test/3/data/data2.in b/Hydro/system_test/3/data/data2.in
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/3/data/data2.in
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diff --git a/Hydro/system_test/3/data/data3.in b/Hydro/system_test/3/data/data3.in
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/3/data/data3.in
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+oid sha256:eea8254c7500ba3de996aa8ad6af399183f04e17d4a8102fde539dbc93a90012
+size 4
diff --git a/Hydro/system_test/3/data/data4.in b/Hydro/system_test/3/data/data4.in
new file mode 100644
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--- /dev/null
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diff --git a/Hydro/system_test/3/data/data5.in b/Hydro/system_test/3/data/data5.in
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/3/data/data5.in
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+size 6
diff --git a/Hydro/system_test/3/data/data6.in b/Hydro/system_test/3/data/data6.in
new file mode 100644
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--- /dev/null
+++ b/Hydro/system_test/3/data/data6.in
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--- /dev/null
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+type: interactive
+time: 100ms
+memory: 64m
+interactor: interactor.cc
diff --git a/Hydro/system_test/5/data/interactor.cc b/Hydro/system_test/5/data/interactor.cc
new file mode 100644
index 00000000..34c41e0a
--- /dev/null
+++ b/Hydro/system_test/5/data/interactor.cc
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+#include <iostream>
+
+#include "testlib.h"
+
+using namespace std;
+
+int main(int argc, char* argv[]) {
+    setName("Interactor A+B");
+    registerInteraction(argc, argv);
+
+    // reads number of queries from test (input) file
+    int a = inf.readInt();
+    int b = inf.readInt();
+    // writes query to the solution, endl makes flush
+    cout << a << " " << b << endl;
+    int ans;
+    cin >> ans;
+    if (a + b == ans)
+        quitf(_ok, "!");
+    else
+        quitf(_wa, "?");
+}
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+time: 100ms
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+subtasks:
+  - score: 20
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+        output: data1-2.ans
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+  - score: 20
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+  - score: 20
+    id: 2
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+      - input: data3-5.in
+        output: data3-5.ans
+  - score: 20
+    id: 3
+    if: [2]
+    cases:
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+      - input: data4-4.in
+        output: data4-4.ans
+      - input: data4-5.in
+        output: data4-5.ans
+  - score: 20
+    id: 4
+    if: [1, 3]
+    cases:
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+        output: data5-1.ans
+      - input: data5-2.in
+        output: data5-2.ans
+      - input: data5-3.in
+        output: data5-3.ans
+      - input: data5-4.in
+        output: data5-4.ans
+      - input: data5-5.in
+        output: data5-5.ans
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