diff --git a/models.go b/models.go
new file mode 100644
index 0000000..c3d395b
--- /dev/null
+++ b/models.go
@@ -0,0 +1,43 @@
+package rulesets
+
+// NOTE: IMMUTABLE THINGS HERE //
+
+const MOVE_UP = "up"
+const MOVE_DOWN = "down"
+const MOVE_RIGHT = "right"
+const MOVE_LEFT = "left"
+
+type Game struct {
+	Height int32
+	Width  int32
+}
+
+type SnakeMove struct {
+	Snake *Snake
+	Move  string
+}
+
+// NOTE: MUTABLE THINGS HERE //
+
+type Point struct {
+	X int32
+	Y int32
+}
+
+type Snake struct {
+	ID              string
+	Body            []*Point
+	Health          int32
+	EliminatedCause string
+}
+
+type GameState struct {
+	Food   []*Point
+	Snakes []*Snake
+}
+
+// RULESET API //
+
+type Ruleset interface {
+	ResolveMoves(*Game, *GameState, []*SnakeMove) (*GameState, error)
+}