diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..4d1227e
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1758427187,
+        "narHash": "sha256-pHpxZ/IyCwoTQPtFIAG2QaxuSm8jWzrzBGjwQZIttJc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "554be6495561ff07b6c724047bdd7e0716aa7b46",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..802b4ff
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,41 @@
+{
+  description = "C Project with Check, Valgrind, Gcov support";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+
+      buildInputs = with pkgs; [
+        check         # для unit-тестов
+        valgrind      # для проверки утечек
+        lcov          # для отчетов gcov
+        clang-tools   # clang-format
+        gcc           # компилятор
+        gnumake       # make
+        ncurses       # для TUI/CLI приложений
+        readline      # для readline поддержки
+        zlib          # сжатие данных
+        libxml2       # XML parsing
+        curl          # HTTP клиент
+        openssl       # криптография
+        sqlite        # база данных
+      ];
+    in {
+      devShells.default = pkgs.mkShell {
+        inherit buildInputs;
+
+        shellHook = ''
+          echo "✅ C Project Dev Environment Loaded"
+          echo "🔧 Available tools:"
+          echo "   - gcc, make, clang-format"
+          echo "   - checkmk, valgrind, lcov"
+          echo "🚀 Run 'make test' to build and run tests"
+        '';
+      };
+    });
+}
diff --git a/src/Makefile b/src/Makefile
index e69de29..f565e1f 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -0,0 +1,48 @@
+CC = gcc
+CFLAGS = -std=c11 -Wall -Wextra -Werror -g
+LDFLAGS = -lncurses
+TETRISDIR = brick_game/tetris
+CLIDIR = gui/cli
+
+# Файлы
+TETRIS_SRC = $(TETRISDIR)/tetris.c
+CLI_SRC = $(CLIDIR)/main.c $(CLIDIR)/display.c
+OBJ = $(TETRIS_SRC:.c=.o) $(CLI_SRC:.c=.o)
+
+# Имя исполняемого файла
+TARGET = tetris
+
+# Установка
+PREFIX ?= /usr/local
+BINDIR = $(PREFIX)/bin
+
+.PHONY: all install uninstall clean test gcov_report
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CC) $(OBJ) -o $@ $(LDFLAGS)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+install: $(TARGET)
+	install -m 755 $(TARGET) $(BINDIR)/
+
+uninstall:
+	rm -f $(BINDIR)/$(TARGET)
+
+clean:
+	rm -f $(OBJ) $(TARGET) *.gcda *.gcno *.gcov
+
+test:
+	@echo "Running tests..."
+	# Здесь будет вызов тестов, если они есть
+
+gcov_report: CFLAGS += --coverage
+gcov_report: clean $(TARGET)
+	./$(TARGET)
+	gcov $(TETRIS_SRC)
+	lcov --capture --directory . --output-file coverage.info
+	genhtml coverage.info --output-directory coverage_report
+	@echo "Coverage report generated in coverage_report/index.html"
\ No newline at end of file
diff --git a/src/brick_game/tetris/fsm.c b/src/brick_game/tetris/fsm.c
deleted file mode 100644
index e69de29..0000000