diff --git a/Input.c b/Input.c
new file mode 100644
index 0000000..ee2a478
--- /dev/null
+++ b/Input.c
@@ -0,0 +1,47 @@
+
+#include "Input.h"
+
+#include <stdlib.h>
+#include <windows.h>
+
+
+void input_SetDefaultKeymap(System_Input *sys) {
+	sys->systemKeymap[input_Key_Up]     = 'W';
+	sys->systemKeymap[input_Key_Left]   = 'A';
+	sys->systemKeymap[input_Key_Down]   = 'S';
+	sys->systemKeymap[input_Key_Right]  = 'D';
+	sys->systemKeymap[input_Key_Jump]   = VK_SPACE;
+	sys->systemKeymap[input_Key_Attack] = 'J';
+	sys->systemKeymap[input_Key_Spell]  = 'K';
+	sys->systemKeymap[input_Key_Use]    = 'L';
+}
+
+System_Input *input_NewSystem() {
+	System_Input *sys = malloc(sizeof(System_Input));
+	return sys;
+}
+
+void input_DeleteSystem(System_Input *sys) {
+	free(sys);
+}
+
+
+void input_Advance(System_Input *sys) {
+	for (int i = 0; i < input_Key_Count; i++) {
+		// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getasynckeystate
+		// Checks the most significiant bit (of the SHORT returned)
+		if ((GetAsyncKeyState(sys->systemKeymap[i]) & 0x8000) != 0) {
+			// Pressed
+			if (sys->keys[i] == JustReleased || sys->keys[i] == Released)
+				sys->keys[i] = JustPressed;
+			else
+				sys->keys[i] = Pressed;
+		} else {
+			// Released
+			if (sys->keys[i] == JustPressed || sys->keys[i] == Pressed)
+				sys->keys[i] = JustReleased;
+			else
+				sys->keys[i] = Released;
+		}
+	}
+}
diff --git a/Input.h b/Input.h
index 638835c..ed90adf 100644
--- a/Input.h
+++ b/Input.h
@@ -22,6 +22,18 @@ typedef enum {
 	input_Key_Count
 } input_Key;
 
+// Names for input_Key
+const char *input_KeyNames[input_Key_Count] = {
+	"Left",
+	"Right",
+	"Up",
+	"Down",
+	"Jump",
+	"Attack",
+	"Spell",
+	"Use"};
+
+
 // States a key might in
 typedef enum {
 	Pressed,
@@ -30,11 +42,29 @@ typedef enum {
 	JustReleased
 } input_KeyState;
 
+static inline bool input_IsPressed(input_KeyState state) { return state == Pressed || state == JustPressed; }
+static inline bool input_IsReleased(input_KeyState state) { return state == Released || state == JustReleased; }
+
+
 typedef struct {
-	input_KeyState keys[input_Key_Count]; // States of keys
+	input_KeyState keys[input_Key_Count];         // States of keys
+	unsigned int   systemKeymap[input_Key_Count]; // Which system key (VK code) this function uses
+												  // https://learn.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes
 } System_Input;
 
 
+// Creates a new input system.
+// Uses a default keymap
+System_Input *input_NewSystem();
+void          input_DeleteSystem(System_Input *sys);
+
+// Sets the keymaps to default.
+void input_SetDefaultKeymap(System_Input *sys);
+
+// Update key states
+void input_Advance(System_Input *sys);
+
+
 #ifdef __cplusplus
 }
 #endif