diff --git a/res/graphics/items/woodpick.png b/res/graphics/items/woodpick.png
new file mode 100644
index 0000000..1cc34da
Binary files /dev/null and b/res/graphics/items/woodpick.png differ
diff --git a/res/graphics/ui/invframe.png b/res/graphics/ui/invframe.png
new file mode 100644
index 0000000..a41e812
Binary files /dev/null and b/res/graphics/ui/invframe.png differ
diff --git a/src/app.rs b/src/app.rs
index 31e7b91..7b2a3dc 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -5,10 +5,10 @@ use gamedebug_core::{imm, imm_dbg};
 use sfml::{
     audio::SoundSource,
     graphics::{
-        BlendMode, Color, Rect, RenderStates, RenderTarget, RenderTexture, RenderWindow, Sprite,
-        Transformable, View,
+        BlendMode, Color, Rect, RectangleShape, RenderStates, RenderTarget, RenderTexture,
+        RenderWindow, Shape, Sprite, Transformable, View,
     },
-    system::Vector2u,
+    system::{Vector2, Vector2u},
     window::{Event, Key},
 };
 
@@ -17,6 +17,7 @@ use crate::{
     game::{for_each_tile_on_screen, Biome, GameState},
     graphics::{self, ScreenSc, ScreenVec},
     input::Input,
+    inventory::TileLayer,
     math::{center_offset, TILE_SIZE},
     res::Res,
     CliArgs,
@@ -231,15 +232,22 @@ impl App {
             self.game.world.player.col_en.en.pos.y = wpos.y as i32;
         }
         if self.input.lmb_down {
-            let t = self.game.world.tile_at_mut(mouse_tpos, &self.game.worldgen);
-            t.mid = 0;
-            t.fg = 0;
-        } else if self.input.rmb_down {
-            let t = self.game.world.tile_at_mut(mouse_tpos, &self.game.worldgen);
-            if self.game.tile_to_place != 7 {
-                t.mid = self.game.tile_to_place;
-            } else {
-                t.bg = self.game.tile_to_place;
+            let active_slot = &self.game.inventory.slots[self.game.selected_inv_slot];
+            if active_slot.qty != 0 {
+                let def = &self.game.itemdb.db[active_slot.id as usize];
+                let t = self.game.world.tile_at_mut(mouse_tpos, &self.game.worldgen);
+                match &def.use_action {
+                    crate::inventory::UseAction::PlaceTile { layer, id } => match layer {
+                        TileLayer::Bg => t.bg = *id,
+                        TileLayer::Mid => t.mid = *id,
+                        TileLayer::Fg => t.fg = *id,
+                    },
+                    crate::inventory::UseAction::RemoveTile { layer } => match layer {
+                        TileLayer::Bg => t.bg = 0,
+                        TileLayer::Mid => t.mid = 0,
+                        TileLayer::Fg => t.fg = 0,
+                    },
+                }
             }
         }
         if self.game.camera_offset.y > 643_000 {
@@ -262,7 +270,7 @@ impl App {
                 }
             }
         }
-        self.game.update();
+        self.game.update(&self.input);
     }
 
     fn do_freecam(&mut self) {
@@ -305,6 +313,18 @@ impl App {
         self.light_map.display();
         spr.set_texture(self.light_map.texture(), false);
         self.rw.draw_with_renderstates(&spr, &rst);
+        drop(spr);
+        // Draw ui on top of in-game scene
+        self.rt.clear(Color::TRANSPARENT);
+        let ui_dims = Vector2 {
+            x: (self.rw.size().x / self.scale as u32) as f32,
+            y: (self.rw.size().y / self.scale as u32) as f32,
+        };
+        self.game.draw_ui(&mut self.rt, &self.res, ui_dims);
+        self.rt.display();
+        let mut spr = Sprite::with_texture(self.rt.texture());
+        spr.set_scale((self.scale as f32, self.scale as f32));
+        self.rw.draw(&spr);
         self.sf_egui
             .do_frame(|ctx| {
                 debug::do_debug_ui(
@@ -317,6 +337,14 @@ impl App {
             })
             .unwrap();
         self.sf_egui.draw(&mut self.rw, None);
+        if self.debug.show_atlas {
+            let atlas = &self.res.atlas.tex;
+            let size = atlas.size();
+            let mut rs = RectangleShape::from_rect(Rect::new(0., 0., size.x as f32, size.y as f32));
+            rs.set_fill_color(Color::MAGENTA);
+            self.rw.draw(&rs);
+            self.rw.draw(&Sprite::with_texture(atlas));
+        }
         self.rw.display();
     }
 }
diff --git a/src/debug.rs b/src/debug.rs
index a6655f3..1ad62b1 100644
--- a/src/debug.rs
+++ b/src/debug.rs
@@ -1,4 +1,4 @@
-use egui_inspect::inspect;
+use egui_inspect::{derive::Inspect, inspect};
 use sfml::{audio::SoundSource, window::Key};
 
 use crate::{
@@ -11,11 +11,12 @@ use crate::{
     tiles::tiledb_edit_ui::tiledb_edit_ui,
 };
 
-#[derive(Default, Debug)]
+#[derive(Default, Debug, Inspect)]
 pub struct DebugState {
     panel: bool,
     pub freecam: bool,
     tiledb_edit: bool,
+    pub show_atlas: bool,
 }
 
 impl DebugState {
@@ -30,7 +31,7 @@ impl DebugState {
 }
 
 fn debug_panel_ui(
-    debug: &mut DebugState,
+    mut debug: &mut DebugState,
     mut game: &mut GameState,
     ctx: &egui::Context,
     res: &mut Res,
@@ -85,7 +86,7 @@ fn debug_panel_ui(
                     ui,
                     scale,
                     game,
-                    debug.tiledb_edit
+                    debug
                 }
             });
         if ui.button("Reload graphics").clicked() {
diff --git a/src/game.rs b/src/game.rs
index ab2c282..81789e0 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -3,16 +3,21 @@ use std::path::PathBuf;
 use derivative::Derivative;
 use egui_inspect::derive::Inspect;
 use sfml::{
-    graphics::{Color, RectangleShape, RenderTarget, RenderTexture, Shape, Sprite, Transformable},
-    system::Vector2u,
+    graphics::{
+        Color, Rect, RectangleShape, RenderTarget, RenderTexture, Shape, Sprite, Transformable,
+    },
+    system::{Vector2f, Vector2u},
+    window::Key,
 };
 
 use crate::{
     graphics::{ScreenSc, ScreenVec},
+    input::Input,
+    inventory::{Inventory, ItemDb},
     math::{smoothwave, wp_to_tp, WorldPos},
     res::Res,
     tiles::TileDb,
-    world::{Tile, TileId, TilePos, World},
+    world::{Tile, TilePos, World},
     worldgen::Worldgen,
 };
 
@@ -22,7 +27,6 @@ pub struct GameState {
     pub camera_offset: WorldPos,
     pub world: World,
     pub gravity: f32,
-    pub tile_to_place: TileId,
     pub current_biome: Biome,
     pub prev_biome: Biome,
     #[derivative(Debug = "ignore")]
@@ -31,6 +35,9 @@ pub struct GameState {
     pub ambient_light: u8,
     pub light_sources: Vec<LightSource>,
     pub tile_db: TileDb,
+    pub inventory: Inventory,
+    pub itemdb: ItemDb,
+    pub selected_inv_slot: usize,
 }
 
 #[derive(Debug, Inspect)]
@@ -45,7 +52,22 @@ pub enum Biome {
 }
 
 impl GameState {
-    pub fn update(&mut self) {
+    pub fn update(&mut self, input: &Input) {
+        if input.pressed(Key::Num1) {
+            self.selected_inv_slot = 0;
+        }
+        if input.pressed(Key::Num2) {
+            self.selected_inv_slot = 1;
+        }
+        if input.pressed(Key::Num3) {
+            self.selected_inv_slot = 2;
+        }
+        if input.pressed(Key::Num4) {
+            self.selected_inv_slot = 3;
+        }
+        if input.pressed(Key::Num5) {
+            self.selected_inv_slot = 4;
+        }
         self.world.ticks += 1;
     }
     pub(crate) fn draw_world(&mut self, rt: &mut RenderTexture, res: &mut Res) {
@@ -75,7 +97,7 @@ impl GameState {
             }
         });
     }
-    pub fn draw_entities(&mut self, rw: &mut RenderTexture) {
+    pub fn draw_entities(&mut self, rt: &mut RenderTexture) {
         let (x, y, w, h) = self.world.player.col_en.en.xywh();
         let mut rect_sh = RectangleShape::new();
         rect_sh.set_position((
@@ -83,14 +105,39 @@ impl GameState {
             (y - self.camera_offset.y as i32) as f32,
         ));
         rect_sh.set_size((w as f32, h as f32));
-        rw.draw(&rect_sh);
+        rt.draw(&rect_sh);
         rect_sh.set_size((2., 2.));
         rect_sh.set_fill_color(Color::RED);
         rect_sh.set_position((
             (self.world.player.col_en.en.pos.x - self.camera_offset.x as i32) as f32,
             (self.world.player.col_en.en.pos.y - self.camera_offset.y as i32) as f32,
         ));
-        rw.draw(&rect_sh);
+        rt.draw(&rect_sh);
+    }
+
+    pub fn draw_ui(&mut self, rt: &mut RenderTexture, res: &Res, ui_dims: Vector2f) {
+        let mut s = Sprite::with_texture(&res.atlas.tex);
+        let mut rs = RectangleShape::from_rect(Rect::new(0., 0., 32., 32.));
+        rs.set_outline_color(Color::YELLOW);
+        rs.set_outline_thickness(1.0);
+        rs.set_fill_color(Color::TRANSPARENT);
+        for (i, slot) in self.inventory.slots.iter().enumerate() {
+            s.set_texture_rect(res.atlas.rects["ui/invframe"].to_sf());
+            let pos = ((i * 38) as f32 + 8.0, (ui_dims.y - 38.));
+            s.set_position(pos);
+            rt.draw(&s);
+            let item_def = &self.itemdb.db[slot.id as usize];
+            if let Some(rect) = res.atlas.rects.get(&item_def.graphic_name) {
+                s.set_texture_rect(rect.to_sf());
+                rt.draw(&s);
+            } else {
+                log::error!("Missing rect for item {}", item_def.name);
+            }
+            if i == self.selected_inv_slot {
+                rs.set_position(pos);
+                rt.draw(&rs);
+            }
+        }
     }
 
     pub(crate) fn light_pass(&mut self, lightmap: &mut RenderTexture, res: &Res) {
@@ -126,13 +173,15 @@ impl GameState {
             camera_offset: spawn_point,
             world: World::new(spawn_point, &world_name, path),
             gravity: 0.55,
-            tile_to_place: 1,
             current_biome: Biome::Surface,
             prev_biome: Biome::Surface,
             worldgen: Worldgen::from_seed(0),
             ambient_light: 0,
             light_sources: Vec::new(),
             tile_db,
+            inventory: Inventory::new_debug(),
+            itemdb: ItemDb::default(),
+            selected_inv_slot: 0,
         }
     }
 }
diff --git a/src/inventory.rs b/src/inventory.rs
new file mode 100644
index 0000000..7922a1d
--- /dev/null
+++ b/src/inventory.rs
@@ -0,0 +1,130 @@
+use egui_inspect::derive::Inspect;
+
+use crate::{math::IntRect, world::TileId};
+
+/// We won't have more than 65535 different items
+pub type ItemId = u16;
+/// We won't have more than 65535 item quantity in a single slot
+pub type ItemQty = u16;
+
+/// Inventory slot
+#[derive(Debug, Inspect)]
+pub struct Slot {
+    pub id: ItemId,
+    pub qty: ItemQty,
+}
+
+#[derive(Debug, Inspect)]
+pub struct Inventory {
+    pub slots: Vec<Slot>,
+}
+impl Inventory {
+    /// A new inventory filled with some debug items
+    pub(crate) fn new_debug() -> Inventory {
+        Self {
+            slots: vec![
+                Slot {
+                    id: items::WOOD_PICK,
+                    qty: 1,
+                },
+                Slot {
+                    id: items::DIRT_BLOCK,
+                    qty: 100,
+                },
+                Slot {
+                    id: items::TORCH,
+                    qty: 100,
+                },
+                Slot {
+                    id: items::PLATFORM,
+                    qty: 100,
+                },
+            ],
+        }
+    }
+}
+
+#[derive(Debug, Inspect)]
+pub struct ItemDef {
+    pub name: String,
+    pub graphic_name: String,
+    pub tex_rect: IntRect,
+    #[opaque]
+    pub use_action: UseAction,
+    pub consumable: bool,
+}
+
+#[derive(Debug, Inspect, PartialEq)]
+pub enum TileLayer {
+    Bg,
+    Mid,
+    Fg,
+}
+
+#[derive(Debug)]
+pub enum UseAction {
+    PlaceTile { layer: TileLayer, id: TileId },
+    RemoveTile { layer: TileLayer },
+}
+
+#[derive(Debug, Inspect)]
+pub struct ItemDb {
+    pub db: Vec<ItemDef>,
+}
+
+impl Default for ItemDb {
+    fn default() -> Self {
+        Self {
+            db: vec![
+                ItemDef {
+                    name: String::from("Dirt Block"),
+                    graphic_name: String::from("tiles/dirt"),
+                    tex_rect: IntRect::default(),
+                    use_action: UseAction::PlaceTile {
+                        layer: TileLayer::Mid,
+                        id: 3,
+                    },
+                    consumable: true,
+                },
+                ItemDef {
+                    name: String::from("Torch"),
+                    graphic_name: String::from("tiles/torch"),
+                    tex_rect: IntRect::default(),
+                    use_action: UseAction::PlaceTile {
+                        layer: TileLayer::Mid,
+                        id: 4,
+                    },
+                    consumable: true,
+                },
+                ItemDef {
+                    name: String::from("Platform"),
+                    graphic_name: String::from("tiles/platform"),
+                    tex_rect: IntRect::default(),
+                    use_action: UseAction::PlaceTile {
+                        layer: TileLayer::Mid,
+                        id: 5,
+                    },
+                    consumable: true,
+                },
+                ItemDef {
+                    name: String::from("Wood Pick"),
+                    graphic_name: String::from("items/woodpick"),
+                    tex_rect: IntRect::default(),
+                    use_action: UseAction::RemoveTile {
+                        layer: TileLayer::Mid,
+                    },
+                    consumable: true,
+                },
+            ],
+        }
+    }
+}
+
+pub mod items {
+    use super::ItemId;
+
+    pub const DIRT_BLOCK: ItemId = 0;
+    pub const TORCH: ItemId = 1;
+    pub const PLATFORM: ItemId = 2;
+    pub const WOOD_PICK: ItemId = 3;
+}
diff --git a/src/main.rs b/src/main.rs
index c417982..b6fa0d1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ mod debug;
 mod game;
 mod graphics;
 mod input;
+mod inventory;
 mod math;
 mod player;
 mod res;
diff --git a/src/texture_atlas.rs b/src/texture_atlas.rs
index a4535c6..0c2551e 100644
--- a/src/texture_atlas.rs
+++ b/src/texture_atlas.rs
@@ -20,7 +20,7 @@ impl AtlasBundle {
             max_height: 4096,
             allow_rotation: false,
             border_padding: 0,
-            texture_padding: 1,
+            texture_padding: 0,
             texture_extrusion: 0,
             trim: true,
             texture_outlines: false,
@@ -34,6 +34,11 @@ impl AtlasBundle {
         });
         let mut rects = HashMap::new();
         let mut tex = Texture::new().unwrap();
+        log::info!(
+            "Texture atlas size is: {}x{}",
+            packer.width(),
+            packer.height()
+        );
         if !tex.create(packer.width(), packer.height()) {
             panic!("Failed to create texture");
         }
diff --git a/src/tiles.rs b/src/tiles.rs
index 53ca4b9..fbdbd26 100644
--- a/src/tiles.rs
+++ b/src/tiles.rs
@@ -19,7 +19,6 @@ pub struct TileDef {
     pub light: Option<ScreenVec>,
     /// Platform behavior: Horizontally passable, vertically passable upwards
     pub platform: bool,
-    #[serde(default)]
     pub graphic_name: String,
     pub tex_rect: IntRect,
 }
diff --git a/tiles.dat b/tiles.dat
index 9e30cc0..f42778f 100644
Binary files a/tiles.dat and b/tiles.dat differ