diff --git a/contracts/pingpong.fc b/contracts/pingpong.fc
new file mode 100644
index 0000000..dc55f5f
--- /dev/null
+++ b/contracts/pingpong.fc
@@ -0,0 +1,64 @@
+#include "imports/stdlib.fc";
+
+const op::toggle = "op::toggle"c; 
+
+;; storage variables
+
+;; id is required to be able to create different instances of counters
+;; since addresses in TON depend on the initial state of the contract
+global slice str = "ping";
+
+;; load_data populates storage variables using stored data
+() load_data() impure {
+    var ds = get_data().begin_parse();
+    str = ds~load_slice();
+    ds.end_parse();
+}
+
+;; save_data stores storage variables as a cell into persistent storage
+() save_data() impure {
+    set_data(
+        begin_cell()
+            .store_slice(str)
+            .end_cell()
+    );
+}
+
+;; recv_internal is the main function of the contract and is called when it receives a message from other contracts
+() recv_internal(int my_balance, int msg_value, cell in_msg_full, slice in_msg_body) impure {
+    if (in_msg_body.slice_empty?()) { ;; ignore all empty messages
+        return ();
+    }
+
+    slice cs = in_msg_full.begin_parse();
+    int flags = cs~load_uint(4);
+    if (flags & 1) { ;; ignore all bounced messages
+        return ();
+    }
+
+    load_data(); ;; here we populate the storage variables
+
+    int op = in_msg_body~load_uint(32); ;; by convention, the first 32 bits of incoming message is the op
+    int query_id = in_msg_body~load_uint(64); ;; also by convention, the next 64 bits contain the "query id", although this is not always the case
+
+    if (op == op::increase) {
+        slice str = = begin_cell()
+            .store_slice("pong")
+            .store_ref(null())
+            .end_cell()
+            .begin_parse();
+        save_data();
+        return ();
+    }
+
+    throw(0xffff); ;; if the message contains an op that is not known to this contract, we throw
+}
+
+;; get methods are a means to conveniently read contract data using, for example, HTTP APIs
+;; they are marked with method_id
+;; note that unlike in many other smart contract VMs, get methods cannot be called by other contracts
+
+int get_str() method_id {
+    load_data();
+    return str;
+}