diff --git a/CMakeLists.txt b/CMakeLists.txt
index 29f3dee..60b59ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,7 @@ target_include_directories(sots_addresses INTERFACE ${CMAKE_SOURCE_DIR}/include)
 # ---- engine modules (host + cross): pure, oracle-verified code accrues here ----
 add_subdirectory(src/mars/parse)   # brace-block + .effect readers   (lib mars_parse)
 add_subdirectory(src/mars/text)    # flat-kv, id-manifest, csv       (lib mars_text)
+add_subdirectory(src/game/sim)     # strategic formulas, pure          (lib sots_game_sim)
 
 if(WIN32)
   # ---- shim: proxy binkw32.dll that the original game loads (Phase 2 frontend) ----
@@ -43,7 +44,7 @@ else()
   add_executable(addr_smoke tests/addr_smoke.cpp)
   target_link_libraries(addr_smoke PRIVATE sots_addresses)
   add_test(NAME addr_smoke COMMAND addr_smoke)
-  foreach(_t mars_parse mars_text)
+  foreach(_t mars_parse mars_text game_sim)
     if(EXISTS ${CMAKE_SOURCE_DIR}/tests/${_t}/CMakeLists.txt)
       add_subdirectory(tests/${_t})
     endif()