diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4bb84db..21bcd5a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,7 +19,7 @@ set(ASSETS
 fxconv_declare_assets(${ASSETS} WITH_METADATA)
 
 add_executable(thyaddin ${SOURCES} ${ASSETS})
-target_compile_options(thyaddin PRIVATE -Wall -Wextra -Os)
+target_compile_options(thyaddin PRIVATE -Wall -Wextra -Os -std=c2x)
 target_link_libraries(thyaddin Gint::Gint)
 
 generate_g3a(TARGET thyaddin OUTPUT "lzy.g3a"
diff --git a/Makefile b/Makefile
index 7b062da..50ed610 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC ?= gcc
-CFLAGS = -std=c99 -Wall -Wextra -pedantic -O3 -I./inc -MMD $(shell sdl2-config --cflags)
+CFLAGS = -std=c2x -Wall -Wextra -pedantic -O3 -I./inc -MMD $(shell sdl2-config --cflags)
 LDFLAGS = -lSDL2 -lSDL2_image -lSDL2_mixer $(shell sdl2-config --libs)
 
 OBJ_NAME = lzy
diff --git a/compile_flags.txt b/compile_flags.txt
new file mode 100644
index 0000000..19fed3c
--- /dev/null
+++ b/compile_flags.txt
@@ -0,0 +1,4 @@
+-Wall
+-Wextra
+-std=c2x
+-Iinc
diff --git a/inc/lzy.h b/inc/lzy.h
index 22c7723..ea748d0 100644
--- a/inc/lzy.h
+++ b/inc/lzy.h
@@ -28,8 +28,6 @@ extern "C" {
 
 #include <stdint.h>
 
-#define LZY_UNUSED(x) (void)(x)
-
 #ifdef FXCG50
 #include <gint/keycodes.h>
 typedef void LZY_Music;
@@ -80,38 +78,42 @@ typedef struct LZY_Event {
 	LZY_EventUnion u;
 } LZY_Event;
 
-int LZY_Init(const char *title, int target_fps, const char *tset_path,
-             const char *font_path);
+[[nodiscard]] int LZY_Init(const char *title, int target_fps,
+                           const char *tset_path, const char *font_path);
 void LZY_Quit(void);
-int LZY_DrawBegin(void);
-int LZY_DrawEnd(void);
+[[nodiscard]] int LZY_DrawBegin(void);
+[[nodiscard]] int LZY_DrawEnd(void);
 void LZY_DrawSetColor(uint8_t r, uint8_t g, uint8_t b);
 void LZY_DrawSetColorNone(void);
-int LZY_DrawClear(void);
-int LZY_DrawPoint(int x, int y);
-int LZY_DrawLine(int x0, int y0, int x1, int y1);
-int LZY_DrawRect(int x, int y, int w, int h);
-int LZY_DrawFillRect(int x, int y, int w, int h);
-int LZY_DrawTile(unsigned int id, int x, int y);
-int LZY_DrawTileEx(unsigned int id, int x, int y, unsigned int w,
-                   unsigned int h);
-int LZY_DrawChar(unsigned char chr, int x, int y);
-int LZY_DrawText(int x, int y, const char *text);
-int LZY_DrawTextF(int x, int y, const char *fmt, ...);
-LZY_Music *LZY_MusicLoad(const char *path);
-int LZY_MusicDestroy(LZY_Music *music);
-int LZY_MusicPlay(LZY_Music *music, int loops);
-LZY_Sound *LZY_SoundLoad(const char *path);
-int LZY_SoundDestroy(LZY_Sound *sound);
+[[nodiscard]] int LZY_DrawClear(void);
+[[nodiscard]] int LZY_DrawPoint(int x, int y);
+[[nodiscard]] int LZY_DrawLine(int x0, int y0, int x1, int y1);
+[[nodiscard]] int LZY_DrawRect(int x, int y, int w, int h);
+[[nodiscard]] int LZY_FillRect(int x, int y, int w, int h);
+[[nodiscard]] int LZY_DrawTile(unsigned int id, int x, int y);
+[[nodiscard]] int LZY_DrawTileEx(unsigned int id, int x, int y, unsigned int w,
+                                 unsigned int h);
+[[nodiscard]] int LZY_DrawChar(unsigned char chr, int x, int y);
+[[nodiscard]] int LZY_DrawText(int x, int y, const char *text);
+[[nodiscard]] int LZY_DrawTextF(int x, int y, const char *fmt, ...);
+[[nodiscard]] LZY_Music *LZY_MusicLoad(const char *path);
+[[nodiscard]] int LZY_MusicDestroy(LZY_Music *music);
+[[nodiscard]] int LZY_MusicPlay(LZY_Music *music, int loops);
+[[nodiscard]] LZY_Sound *LZY_SoundLoad(const char *path);
+[[nodiscard]] int LZY_SoundDestroy(LZY_Sound *sound);
 void LZY_SoundSetVolume(LZY_Sound *sound, float volume);
-int LZY_SoundPlay(LZY_Sound *sound, int loops);
+[[nodiscard]] int LZY_SoundPlay(LZY_Sound *sound, int loops);
 int LZY_PollEvent(LZY_Event *);
 void LZY_CycleEvents(void);
 int LZY_KeyDown(unsigned int key);
 int LZY_ShouldQuit(void);
 void LZY_Log(const char *fmt, ...);
+int LZY_LogError(int rv);
 const char *LZY_GetError(void);
 
+[[deprecated("renamed to LZY_FillRect")]] [[nodiscard]] int
+LZY_DrawFillRect(int x, int y, int w, int h);
+
 #ifdef __cplusplus
 }
 #endif
@@ -193,6 +195,16 @@ int LZY_DrawTextF(int x, int y, const char *fmt, ...) {
 	return LZY_DrawText(x, y, buf);
 }
 
+int LZY_LogError(int rv) {
+	LZY_Log("%s", LZY_GetError());
+
+	return rv;
+}
+
+int LZY_DrawFillRect(int x, int y, int w, int h) {
+	return LZY_FillRect(x, y, w, h);
+}
+
 #ifdef FXCG50
 #include <gint/cpu.h>
 #include <gint/display.h>
@@ -214,15 +226,12 @@ static int _LZY_Sign(int n) {
 	return (n > 0) - (n < 0);
 }
 
-int LZY_Init(const char *title, int target_fps, const char *tset_path,
-             const char *font_path) {
+int LZY_Init([[maybe_unused]] const char *title, int target_fps,
+             [[maybe_unused]] const char *tset_path,
+             [[maybe_unused]] const char *font_path) {
 	extern bopti_image_t LZY_GINT_TILESET;
 	extern bopti_image_t LZY_GINT_FONT;
 
-	LZY_UNUSED(title);
-	LZY_UNUSED(tset_path);
-	LZY_UNUSED(font_path);
-
 	tset_width = LZY_GINT_TILESET.width / LZY_TILE_SIZE;
 	tset_height = LZY_GINT_TILESET.height / LZY_TILE_SIZE;
 
@@ -291,7 +300,7 @@ int LZY_DrawRect(int x, int y, int w, int h) {
 	return 0;
 }
 
-int LZY_DrawFillRect(int x, int y, int w, int h) {
+int LZY_FillRect(int x, int y, int w, int h) {
 	w += w == 0;
 	h += h == 0;
 	x += draw_off_x;
@@ -378,40 +387,32 @@ int LZY_DrawText(int x, int y, const char *text) {
 	return err;
 }
 
-LZY_Music *LZY_MusicLoad(const char *path) {
-	LZY_UNUSED(path);
+LZY_Music *LZY_MusicLoad([[maybe_unused]] const char *path) {
 	return NULL;
 }
 
-int LZY_MusicDestroy(LZY_Music *music) {
-	LZY_UNUSED(music);
+int LZY_MusicDestroy([[maybe_unused]] LZY_Music *music) {
 	return -1;
 }
 
-int LZY_MusicPlay(LZY_Music *music, int loops) {
-	LZY_UNUSED(music);
-	LZY_UNUSED(loops);
+int LZY_MusicPlay([[maybe_unused]] LZY_Music *music,
+                  [[maybe_unused]] int loops) {
 	return -1;
 }
 
-LZY_Sound *LZY_SoundLoad(const char *path) {
-	LZY_UNUSED(path);
+LZY_Sound *LZY_SoundLoad([[maybe_unused]] const char *path) {
 	return NULL;
 }
 
-int LZY_SoundDestroy(LZY_Sound *sound) {
-	LZY_UNUSED(sound);
+int LZY_SoundDestroy([[maybe_unused]] LZY_Sound *sound) {
 	return -1;
 }
 
-void LZY_SoundSetVolume(LZY_Sound *sound, float volume) {
-	LZY_UNUSED(sound);
-	LZY_UNUSED(volume);
-}
+void LZY_SoundSetVolume([[maybe_unused]] LZY_Sound *sound,
+                        [[maybe_unused]] float volume) {}
 
-int LZY_SoundPlay(LZY_Sound *sound, int loops) {
-	LZY_UNUSED(sound);
-	LZY_UNUSED(loops);
+int LZY_SoundPlay([[maybe_unused]] LZY_Sound *sound,
+                  [[maybe_unused]] int loops) {
 	return -1;
 }
 
@@ -451,9 +452,7 @@ int LZY_ShouldQuit(void) {
 	return should_quit;
 }
 
-void LZY_Log(const char *fmt, ...) {
-	LZY_UNUSED(fmt);
-}
+void LZY_Log([[maybe_unused]] const char *fmt, ...) {}
 
 const char *LZY_GetError(void) {
 	return NULL;
@@ -469,12 +468,9 @@ const char *LZY_GetError(void) {
 #include <string.h>
 
 static const SDL_Scancode sc[LZYK_COUNT * 2] = {
-    SDL_SCANCODE_LEFT,  SDL_SCANCODE_A,
-    SDL_SCANCODE_RIGHT, SDL_SCANCODE_D,
-    SDL_SCANCODE_UP,    SDL_SCANCODE_W,
-    SDL_SCANCODE_DOWN,  SDL_SCANCODE_S,
-    SDL_SCANCODE_Z,     SDL_SCANCODE_J,
-    SDL_SCANCODE_X,     SDL_SCANCODE_K,
+    SDL_SCANCODE_LEFT, SDL_SCANCODE_A, SDL_SCANCODE_RIGHT, SDL_SCANCODE_D,
+    SDL_SCANCODE_UP,   SDL_SCANCODE_W, SDL_SCANCODE_DOWN,  SDL_SCANCODE_S,
+    SDL_SCANCODE_Z,    SDL_SCANCODE_J, SDL_SCANCODE_X,     SDL_SCANCODE_K,
 };
 static const SDL_Scancode fullscreen_sc = SDL_SCANCODE_F11;
 static const char *error = NULL;
@@ -737,7 +733,7 @@ int LZY_DrawRect(int x, int y, int w, int h) {
 	return 0;
 }
 
-int LZY_DrawFillRect(int x, int y, int w, int h) {
+int LZY_FillRect(int x, int y, int w, int h) {
 	const SDL_Rect rect = {x, y, w + (w == 0), h + (h == 0)};
 
 	if (SDL_RenderFillRect(renderer, &rect) < 0) {
@@ -955,10 +951,10 @@ int LZY_PollEvent(LZY_Event *e) {
 			if (!sdl_e.key.repeat) {
 				int i = LZYK_COUNT;
 				while (i-- > 0) {
-					if (sc[i*2] ==
-					    sdl_e.key.keysym.scancode ||
-					    sc[i*2 + 1] ==
-					    sdl_e.key.keysym.scancode) {
+					if (sc[i * 2] ==
+					        sdl_e.key.keysym.scancode ||
+					    sc[i * 2 + 1] ==
+					        sdl_e.key.keysym.scancode) {
 						e->type = LZY_KEYDOWN;
 						e->u.key.scancode = i;
 						input[i] = 1;
@@ -979,8 +975,9 @@ int LZY_PollEvent(LZY_Event *e) {
 		case SDL_KEYUP: {
 			int i = LZYK_COUNT;
 			while (i-- > 0) {
-				if (sc[i*2] == sdl_e.key.keysym.scancode ||
-				    sc[i*2 + 1] == sdl_e.key.keysym.scancode) {
+				if (sc[i * 2] == sdl_e.key.keysym.scancode ||
+				    sc[i * 2 + 1] ==
+				        sdl_e.key.keysym.scancode) {
 					e->type = LZY_KEYUP;
 					e->u.key.scancode = i;
 					input[i] = 0;