diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 249acd1..2596e4c 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -17,11 +17,12 @@ jobs:
     - name: Install Deps
       run: |
         sudo apt update
-        sudo apt install libsdl2-dev libsdl2-ttf-dev librtmidi-dev nlohmann-json3-dev
+        sudo apt install libsdl2-dev libsdl2-ttf-dev librtmidi-dev nlohmann-json3-dev ninja-build
 
     - name: Build
       run: |
-        mkdir -p out/${{ matrix.build-type }}
-        cd out/${{ matrix.build-type }}
-        cmake -DCMAKE_BUILD_TYPE=${{ matrix.build-type }} ../../
-        make -j4
+        cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=${{ matrix.build-type }}
+        cmake --build build
+
+    - name: Test
+      run: ctest --output-on-failure --test-dir build
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index fee7652..73d8445 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -51,6 +51,9 @@ jobs:
         cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_COMPILE_WARNING_AS_ERROR=YES
         cmake --build build
 
+    - name: Test
+      run: ctest --output-on-failure --test-dir build
+
     - name: Package
       run: |
         cp build/system3.exe COPYING.txt dist/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6b3bc40..9746d2a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,7 @@ endif ()
 
 project(System3 LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 17)
+include(CTest)
 
 # Generates a static library from pkg_check_modules() result
 function(add_static_library name pkg)
@@ -250,3 +251,7 @@ endif()
 
 target_compile_definitions(system3 PRIVATE RESOURCE_PATH="${RESOURCE_PATH}")
 target_include_directories(system3 PRIVATE src src/sys)
+
+if (BUILD_TESTING AND NOT ANDROID AND NOT EMSCRIPTEN AND NOT NINTENDO_SWITCH)
+  add_subdirectory(test)
+endif()
diff --git a/src/sys/game_id.cpp b/src/sys/game_id.cpp
index dcff0fd..27c5c24 100644
--- a/src/sys/game_id.cpp
+++ b/src/sys/game_id.cpp
@@ -96,6 +96,7 @@ const struct CRCTable {
 	uint32 crc32_a;
 	uint32 crc32_b;
 } crc_table[] = {
+	{GameId::SYSTEM1_GENERIC, "system1_generic", 1, "System 1", JAPANESE},
 	{GameId::BUNKASAI, "bunkasai", 1, "あぶない文化祭前夜", JAPANESE, CRC32_BUNKASAI},
 	{GameId::CRESCENT, "crescent", 1, "クレセントムーンがぁる", JAPANESE, CRC32_CRESCENT},
 	{GameId::DPS, "dps", 1, "D.P.S - Dream Program System", JAPANESE, CRC32_DPS},
@@ -122,6 +123,7 @@ const struct CRCTable {
 	{GameId::GAKUEN, "gakuen", 1, "学園戦記", JAPANESE, CRC32_GAKUEN},
 	{GameId::GAKUEN, "gakuen_eng", 1, "Gakuen Senki", ENGLISH, CRC32_GAKUEN_ENG},
 
+	{GameId::SYSTEM2_GENERIC, "system2_generic", 2, "System 2", JAPANESE},
 	{GameId::AYUMI_FD, "ayumi_fd", 2, "あゆみちゃん物語", JAPANESE, CRC32_AYUMI_FD},
 	{GameId::AYUMI_HINT, "ayumi_hint", 2, "あゆみちゃん物語 ヒントディスク", JAPANESE, CRC32_AYUMI_HINT},
 	{GameId::AYUMI_PROTO, "ayumi_proto", 2, "あゆみちゃん物語 PROTO", JAPANESE, CRC32_AYUMI_PROTO},
@@ -138,6 +140,7 @@ const struct CRCTable {
 	{GameId::SDPS_KAIZOKU, "sdps_kaizoku", 2, "Super D.P.S - うれしたのし海賊稼業", JAPANESE, CRC32_SDPS, CRC32_SDPS_KAIZOKU},
 	{GameId::YAKATA2, "yakata2", 2, "ALICEの館II", JAPANESE, CRC32_YAKATA2},
 
+	{GameId::SYSTEM3_GENERIC, "system3_generic", 3, "System 3", JAPANESE},
 	{GameId::AMBIVALENZ_FD, "ambivalenz_fd", 3, "AmbivalenZ −二律背反−", JAPANESE, CRC32_AMBIVALENZ_FD},
 	{GameId::AMBIVALENZ_CD, "ambivalenz_cd", 3, "AmbivalenZ −二律背反−", JAPANESE, CRC32_AMBIVALENZ_CD},
 	{GameId::DPS_ALL, "dps_all", 3, "D.P.S. 全部", JAPANESE, CRC32_DPSALL},
@@ -172,7 +175,7 @@ const struct CRCTable {
 const CRCTable* lookup(uint32 crc32_a, uint32 crc32_b)
 {
 	for (const CRCTable* t = crc_table; t->id; t++) {
-		if (crc32_a == t->crc32_a && (!t->crc32_b || crc32_b == t->crc32_b))
+		if (t->crc32_a && crc32_a == t->crc32_a && (!t->crc32_b || crc32_b == t->crc32_b))
 			return t;
 	}
 	return NULL;
diff --git a/src/sys/game_id.h b/src/sys/game_id.h
index 56dfce6..c6bf125 100644
--- a/src/sys/game_id.h
+++ b/src/sys/game_id.h
@@ -15,6 +15,7 @@ struct GameId {
 		UNKNOWN,
 
 		// System 1
+		SYSTEM1_GENERIC,
 		BUNKASAI,
 		CRESCENT,
 		DPS,
@@ -40,6 +41,7 @@ struct GameId {
 		GAKUEN,
 
 		// System 2
+		SYSTEM2_GENERIC,
 		AYUMI_FD,
 		AYUMI_HINT,
 		AYUMI_PROTO,
@@ -57,6 +59,7 @@ struct GameId {
 		YAKATA2,
 
 		// System 3
+		SYSTEM3_GENERIC,
 		AMBIVALENZ_FD,
 		AMBIVALENZ_CD,
 		DPS_ALL,
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..c9933d8
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,25 @@
+function(add_scenario_test system)
+  set(TEST_DIR ${CMAKE_CURRENT_BINARY_DIR}/scenario/${system})
+  file(MAKE_DIRECTORY ${TEST_DIR})
+  configure_file(scenario/${system}/ADISK.DAT ${TEST_DIR}/ADISK.DAT COPYONLY)
+
+  add_test(
+    NAME scenario_${system}
+    COMMAND $<TARGET_FILE:system3>
+      -gamedir ${TEST_DIR}
+      -game ${system}_generic
+      -encoding utf8
+      -fontfile ${PROJECT_SOURCE_DIR}/resources/fonts/MTLc3m.ttf
+      -texthook print
+    )
+  set_tests_properties(scenario_${system} PROPERTIES
+    ENVIRONMENT "SDL_VIDEODRIVER=dummy;SDL_AUDIODRIVER=dummy"
+    FAIL_REGULAR_EXPRESSION "\\[FAIL\\]"
+    PASS_REGULAR_EXPRESSION "(^|[^0-9])0 tests failed"
+    TIMEOUT 5
+    )
+endfunction()
+
+add_scenario_test(system1)
+add_scenario_test(system2)
+add_scenario_test(system3)
diff --git a/test/README.md b/test/README.md
new file mode 100644
index 0000000..f29367a
--- /dev/null
+++ b/test/README.md
@@ -0,0 +1,16 @@
+# Scenario tests
+
+The scenario tests run compiled System 1, 2, and 3 scenarios through the
+normal engine with SDL's dummy video and audio drivers. CTest checks both the
+process exit status and the `0 tests failed` summary printed through the text
+hook.
+
+`ADISK.DAT` is checked in so that building and running the tests does not
+require [sys3c](https://github.com/kichikuou/sys3c). After installing sys3c
+and changing the scenario sources, regenerate it with:
+
+```sh
+for system in system1 system2 system3; do
+  (cd test/scenario/$system && sys3c)
+done
+```
diff --git a/test/scenario/common/arithmetic.adv b/test/scenario/common/arithmetic.adv
new file mode 100644
index 0000000..dc0f485
--- /dev/null
+++ b/test/scenario/common/arithmetic.adv
@@ -0,0 +1,31 @@
+	; Addition and saturating overflow.
+	{3 + 4 \ 7: !tests_failed : tests_failed + 1! '[FAIL] addition' R}
+	{50000 + 50000 \ 65535: !tests_failed : tests_failed + 1! '[FAIL] addition overflow' R}
+
+	; Subtraction saturates at zero.
+	{10 - 3 \ 7: !tests_failed : tests_failed + 1! '[FAIL] subtraction' R}
+	{3 - 10 \ 0: !tests_failed : tests_failed + 1! '[FAIL] subtraction underflow' R}
+
+	; Multiplication and precedence.
+	{3 * 4 \ 12: !tests_failed : tests_failed + 1! '[FAIL] multiplication' R}
+	{1000 * 1000 \ 65535: !tests_failed : tests_failed + 1! '[FAIL] multiplication overflow' R}
+	{2 + 3 * 4 \ 14: !tests_failed : tests_failed + 1! '[FAIL] precedence' R}
+	{(2 + 3) * 4 \ 20: !tests_failed : tests_failed + 1! '[FAIL] parentheses' R}
+
+	; Comparisons.
+	{3 < 4 \ 1: !tests_failed : tests_failed + 1! '[FAIL] less than' R}
+	{4 < 3 \ 0: !tests_failed : tests_failed + 1! '[FAIL] false less than' R}
+	{4 > 3 \ 1: !tests_failed : tests_failed + 1! '[FAIL] greater than' R}
+	{3 \ 3: !tests_failed : tests_failed + 1! '[FAIL] equality' R}
+	{3 = 4: !tests_failed : tests_failed + 1! '[FAIL] inequality' R}
+
+	; Variables use the same expression evaluator.
+	!actual : 40!
+	!expected : 42!
+	!actual : actual + 2!
+	{actual \ expected: !tests_failed : tests_failed + 1! '[FAIL] variables' R}
+
+	%0:
+
+*default:
+	EOF
diff --git a/test/scenario/common/division.adv b/test/scenario/common/division.adv
new file mode 100644
index 0000000..c410b77
--- /dev/null
+++ b/test/scenario/common/division.adv
@@ -0,0 +1,7 @@
+	{10 / 3 \ 3: !tests_failed : tests_failed + 1! '[FAIL] division' R}
+	{10 / 0 \ 0: !tests_failed : tests_failed + 1! '[FAIL] division by zero' R}
+
+	%0:
+
+*default:
+	EOF
diff --git a/test/scenario/system1/ADISK.DAT b/test/scenario/system1/ADISK.DAT
new file mode 100644
index 0000000..1cff70f
Binary files /dev/null and b/test/scenario/system1/ADISK.DAT differ
diff --git a/test/scenario/system1/sys3c.cfg b/test/scenario/system1/sys3c.cfg
new file mode 100644
index 0000000..951dd3b
--- /dev/null
+++ b/test/scenario/system1/sys3c.cfg
@@ -0,0 +1,4 @@
+game = system1_generic
+hed = test.hed
+encoding = utf8
+unicode = true
diff --git a/test/scenario/system1/test.adv b/test/scenario/system1/test.adv
new file mode 100644
index 0000000..8797da2
--- /dev/null
+++ b/test/scenario/system1/test.adv
@@ -0,0 +1,14 @@
+	!RND : 0!
+	!tests_failed : 0!
+
+	Y 240, 1:
+
+	%#arithmetic.adv:
+
+	; System 1 cannot return the failure count as its process exit status.
+	; Print the success marker only when every assertion passed.
+	{tests_failed = 0: '0 tests failed' R}
+	Y 253, 0:
+
+*default:
+	EOF
diff --git a/test/scenario/system1/test.hed b/test/scenario/system1/test.hed
new file mode 100644
index 0000000..0a16e60
--- /dev/null
+++ b/test/scenario/system1/test.hed
@@ -0,0 +1,2 @@
+test.adv
+../common/arithmetic.adv
diff --git a/test/scenario/system2/ADISK.DAT b/test/scenario/system2/ADISK.DAT
new file mode 100644
index 0000000..6e6c468
Binary files /dev/null and b/test/scenario/system2/ADISK.DAT differ
diff --git a/test/scenario/system2/sys3c.cfg b/test/scenario/system2/sys3c.cfg
new file mode 100644
index 0000000..93f2927
--- /dev/null
+++ b/test/scenario/system2/sys3c.cfg
@@ -0,0 +1,4 @@
+game = system2_generic
+hed = test.hed
+encoding = utf8
+unicode = true
diff --git a/test/scenario/system2/test.adv b/test/scenario/system2/test.adv
new file mode 100644
index 0000000..ca8af75
--- /dev/null
+++ b/test/scenario/system2/test.adv
@@ -0,0 +1,14 @@
+	!RND : 0!
+	!tests_failed : 0!
+
+	Y 240, 1:
+
+	%#arithmetic.adv:
+	%#division.adv:
+
+	H 0, tests_failed: ' tests failed' R
+	!RND : tests_failed!
+	Y 255, 0:
+
+*default:
+	EOF
diff --git a/test/scenario/system2/test.hed b/test/scenario/system2/test.hed
new file mode 100644
index 0000000..a8128a0
--- /dev/null
+++ b/test/scenario/system2/test.hed
@@ -0,0 +1,3 @@
+test.adv
+../common/arithmetic.adv
+../common/division.adv
diff --git a/test/scenario/system3/ADISK.DAT b/test/scenario/system3/ADISK.DAT
new file mode 100644
index 0000000..523c908
Binary files /dev/null and b/test/scenario/system3/ADISK.DAT differ
diff --git a/test/scenario/system3/sys3c.cfg b/test/scenario/system3/sys3c.cfg
new file mode 100644
index 0000000..4a51aa6
--- /dev/null
+++ b/test/scenario/system3/sys3c.cfg
@@ -0,0 +1,4 @@
+game = system3_generic
+hed = test.hed
+encoding = utf8
+unicode = true
diff --git a/test/scenario/system3/test.adv b/test/scenario/system3/test.adv
new file mode 100644
index 0000000..1d3817c
--- /dev/null
+++ b/test/scenario/system3/test.adv
@@ -0,0 +1,16 @@
+	!RND : 0!
+	!tests_failed : 0!
+
+	; System3-sdl2 extension: draw ASCII as half-width characters so the
+	; text-hook output is easy for CTest and humans to read.
+	Y 240, 1:
+
+	%#arithmetic.adv:
+	%#division.adv:
+
+	H 0, tests_failed: ' tests failed' R
+	!RND : tests_failed!
+	Y 255, 0:
+
+*default:
+	EOF
diff --git a/test/scenario/system3/test.hed b/test/scenario/system3/test.hed
new file mode 100644
index 0000000..a8128a0
--- /dev/null
+++ b/test/scenario/system3/test.hed
@@ -0,0 +1,3 @@
+test.adv
+../common/arithmetic.adv
+../common/division.adv