diff --git a/leaderboards.c b/leaderboards.c
new file mode 100644
index 0000000..f94b249
--- /dev/null
+++ b/leaderboards.c
@@ -0,0 +1,77 @@
+
+#include "leaderboards.h"
+#include "types.h"
+#include "util/vector.h"
+#include "util/tree.h"
+#include "util/assert.h"
+#include <string.h>
+
+
+System_Leaderboards *lboard_NewSystem(App *super) {
+	System_Leaderboards *sys = zero_malloc(sizeof(System_Leaderboards));
+	sys->super               = super;
+	sys->levelnames          = vector_Create(sizeof(char *));
+	sys->records             = vector_Create(sizeof(tree_Tree *));
+	return sys;
+}
+
+void lboard_DeleteSystem(System_Leaderboards *sys) {
+	// Free level names
+	for (int i = 0; i < vector_Size(sys->levelnames); i++) {
+		char *str = *(char **)vector_At(sys->levelnames, i);
+		free(str);
+	}
+	vector_Destroy(sys->levelnames);
+
+	// Free records
+	for (int i = 0; i < vector_Size(sys->records); i++) {
+		tree_Tree *tree = *(tree_Tree **)vector_At(sys->levelnames, i);
+		for (tree_Node *node = tree_FirstNode(tree); node != NULL; node = tree_Node_Next(node)) {
+			vector_Vector *names = *(vector_Vector **)node->data;
+			if (names) {
+				for (int j = 0; j < vector_Size(names); j++)
+					free(*(void **)vector_At(names, j));
+				vector_Destroy(names);
+			}
+		}
+		tree_Destroy(tree);
+	}
+	vector_Destroy(sys->records);
+
+	free(sys);
+}
+
+
+int lboard_FindLevel(System_Leaderboards *sys, const char *level) {
+	for (int i = 0; i < vector_Size(sys->levelnames); i++) {
+		char *str = *(char **)vector_At(sys->levelnames, i);
+		if (strcmp(str, level) == 0)
+			return i;
+	}
+	return -1;
+}
+
+void lboard_Insert(System_Leaderboards *sys, const char *level, uintptr_t time_millisec, const char *name) {
+	int indice = lboard_FindLevel(sys, level);
+	if (indice == -1) {
+		// Append a new one
+		char      *level_copy = copy_malloc(level);
+		tree_Tree *empty_tree = tree_Create(sizeof(vector_Vector *));
+		vector_Push(sys->levelnames, level_copy);
+		vector_Push(sys->records, &empty_tree);
+		ASSERT(vector_Size(sys->levelnames) == vector_Size(sys->records));
+		indice = vector_Size(sys->levelnames) - 1;
+	}
+
+	tree_Tree *tree = *(tree_Tree **)vector_At(sys->records, indice);
+
+	// Insert or find this node
+	bool       added;
+	tree_Node *node = tree_Insert(tree, time_millisec, &added);
+	if (added)
+		// Brand new node, create a new vector of names
+		*((vector_Vector **)node->data) = vector_Create(sizeof(char *));
+	// Insert this name
+	char *name_copy = copy_malloc(name);
+	vector_Push(*(vector_Vector **)node->data, &name_copy);
+}
diff --git a/leaderboards.h b/leaderboards.h
new file mode 100644
index 0000000..322d992
--- /dev/null
+++ b/leaderboards.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "util/vector.h"
+#include "util/tree.h"
+#include "types.h"
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+typedef struct _App App;
+
+
+// Leaderboards keep track of level-gametime-username records in leaderboards.txt.
+typedef struct {
+	App *super;
+
+	vector_Vector *levelnames; // vector of allocated char* strings
+	vector_Vector *records;    // vector of tree_Tree* of gametime(milliseconds)->vector of allocated char* strings
+} System_Leaderboards;
+
+
+System_Leaderboards *lboard_NewSystem(App *super);
+void                 lboard_DeleteSystem(System_Leaderboards *sys);
+
+// Find the indice at which this level is located
+// Returns -1 if not found
+int lboard_FindLevel(System_Leaderboards *sys, const char *level);
+// Insert a record.
+void lboard_Insert(System_Leaderboards *sys, const char *level, uintptr_t time_millisec, const char *name);
+
+
+// This should only be called on an empty (newly created) leaderboard.
+void lboard_LoadFromFile(System_Leaderboards *sys, const char *filename);
+void lboard_SaveToFile(System_Leaderboards *sys, const char *filename);
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/leaderboards_file.c b/leaderboards_file.c
new file mode 100644
index 0000000..2abe05c
--- /dev/null
+++ b/leaderboards_file.c
@@ -0,0 +1,27 @@
+
+#include "leaderboards.h"
+#include <stdio.h>
+
+
+void lboard_LoadFromFile(System_Leaderboards *sys, const char *filename) {
+	FILE *f = fopen(filename, "r");
+	if (!f) {
+		WARN("failed to open file\"%s\"", filename);
+		return;
+	}
+
+
+	// Read every line
+	char linebuf[512];
+	memset(linebuf, 0, sizeof(linebuf));
+	while (!feof(f) && fgets(linebuf, sizeof(linebuf), f)) {
+		while (linebuf[strlen(linebuf) - 1] == '\n')
+			linebuf[strlen(linebuf) - 1] = '\0';
+
+		// Skip empty lines
+		if (strlen(linebuf) == 0)
+			continue;
+	}
+}
+void lboard_SaveToFile(System_Leaderboards *sys, const char *filename) {
+}