diff --git a/src/gui/gui.zig b/src/gui/gui.zig
index 4978d219..e039b814 100644
--- a/src/gui/gui.zig
+++ b/src/gui/gui.zig
@@ -565,5 +565,33 @@ const inventory = struct {
 	fn render(mousePos: Vec2f) !void {
 		carriedItemSlot.pos = mousePos;
 		try carriedItemSlot.render(.{0, 0});
+		// Draw tooltip:
+		if(carriedItemStack.amount == 0) if(hoveredItemSlot) |hovered| {
+			if(hovered.itemStack.item) |item| {
+				const tooltip = try item.getTooltip();
+				var textBuffer: graphics.TextBuffer = try graphics.TextBuffer.init(main.threadAllocator, tooltip, .{}, false, .left);
+				defer textBuffer.deinit();
+				var size = try textBuffer.calculateLineBreaks(16, 256);
+				size[0] = 0;
+				for(textBuffer.lineBreaks.items) |lineBreak| {
+					size[0] = @max(size[0], lineBreak.width);
+				}
+				var pos = mousePos;
+				if(pos[0] + size[0] >= main.Window.getWindowSize()[0]/scale) {
+					pos[0] -= size[0];
+				}
+				if(pos[1] + size[1] >= main.Window.getWindowSize()[1]/scale) {
+					pos[1] -= size[1];
+				}
+				pos = @max(pos, Vec2f{0, 0});
+				const border1: f32 = 2;
+				const border2: f32 = 1;
+				draw.setColor(0xffffff00);
+				draw.rect(pos - @splat(2, border1), size + @splat(2, 2*border1));
+				draw.setColor(0xff000000);
+				draw.rect(pos - @splat(2, border2), size + @splat(2, 2*border2));
+				try textBuffer.render(pos[0], pos[1], 16);
+			}
+		};
 	}
 };
\ No newline at end of file
diff --git a/src/items.zig b/src/items.zig
index 96368db2..9a3e85b0 100644
--- a/src/items.zig
+++ b/src/items.zig
@@ -167,6 +167,10 @@ pub const BaseItem = struct {
 		}
 		return self.texture.?;
 	}
+
+	fn getTooltip(self: BaseItem) []const u8 {
+		return self.name;
+	}
 // TODO: Check if/how this is needed:
 //	protected Item(int stackSize) {
 //		id = Resource.EMPTY;
@@ -568,12 +572,12 @@ const TextureGenerator = struct {
 						const lightTR = heightMap[x + 1][y] - heightMap[x][y + 1];
 						var light = 2 - @floatToInt(i32, @round((lightTL * 2 + lightTR) / 6));
 						light = @max(@min(light, 4), 0);
-						img.setRGB(x, y, material.colorPalette[@intCast(usize, light)]);
+						img.setRGB(x, 15 - y, material.colorPalette[@intCast(usize, light)]);
 					} else {
-						img.setRGB(x, y, if((x ^ y) & 1 == 0) Color{.r=255, .g=0, .b=255, .a=255} else Color{.r=0, .g=0, .b=0, .a=255});
+						img.setRGB(x, 15 - y, if((x ^ y) & 1 == 0) Color{.r=255, .g=0, .b=255, .a=255} else Color{.r=0, .g=0, .b=0, .a=255});
 					}
 				} else {
-					img.setRGB(x, y, Color{.r = 0, .g = 0, .b = 0, .a = 0});
+					img.setRGB(x, 15 - y, Color{.r = 0, .g = 0, .b = 0, .a = 0});
 				}
 			}
 		}
@@ -932,6 +936,7 @@ const ToolPhysics = struct {
 const Tool = struct {
 	craftingGrid: [25]?*const BaseItem,
 	materialGrid: [16][16]?*const BaseItem,
+	tooltip: ?[]const u8,
 	image: graphics.Image,
 	texture: ?graphics.Texture,
 	seed: u32,
@@ -967,6 +972,7 @@ const Tool = struct {
 		var self = try main.globalAllocator.create(Tool);
 		self.image = try graphics.Image.init(main.globalAllocator, 16, 16);
 		self.texture = null;
+		self.tooltip = null;
 		return self;
 	}
 
@@ -975,6 +981,7 @@ const Tool = struct {
 			texture.deinit();
 		}
 		self.image.deinit(main.globalAllocator);
+		if(self.tooltip) |tooltip| main.globalAllocator.free(tooltip);
 		main.globalAllocator.destroy(self);
 	}
 
@@ -1036,6 +1043,27 @@ const Tool = struct {
 		}
 		return self.texture.?;
 	}
+	
+	fn getTooltip(self: *Tool) ![]const u8 {
+		if(self.tooltip) |tooltip| return tooltip;
+		self.tooltip = try std.fmt.allocPrint(
+			main.globalAllocator,
+			\\Time to swing: {} s
+			\\Pickaxe power: {} %
+			\\Axe power: {} %
+			\\Shover power: {} %
+			\\Durability: {}/{}
+			,
+			.{
+				self.swingTime,
+				@floatToInt(i32, 100*self.pickaxePower),
+				@floatToInt(i32, 100*self.axePower),
+				@floatToInt(i32, 100*self.shovelPower),
+				self.durability, self.maxDurability,
+			}
+		);
+		return self.tooltip.?;
+	}
 
 	pub fn getPowerByBlockClass(self: *Tool, blockClass: blocks.BlockClass) f32 {
 		return switch(blockClass) {
@@ -1112,6 +1140,17 @@ pub const Item = union(enum) {
 		}
 	}
 
+	pub fn getTooltip(self: Item) ![]const u8 {
+		switch(self) {
+			.baseItem => |_baseItem| {
+				return _baseItem.getTooltip();
+			},
+			.tool => |_tool| {
+				return try _tool.getTooltip();
+			},
+		}
+	}
+
 	pub fn getImage(self: Item) graphics.Image {
 		switch(self) {
 			.baseItem => |_baseItem| {