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# POKéMON SL0P EDITION
<p align="center">
<img src="screenshots/splash.png" width="360" alt="POKéMON SL0P EDITION boot splash">
</p>
A cheeky romhack of **Pokémon Yellow**, built on the [pret/pokeyellow](https://github.com/pret/pokeyellow)
disassembly. Everything is done in pure GBZ80 assembly and used **entirely
in-game** — no external cheat device, no Game Genie. Press **SELECT** in the
overworld and go wild.
> Author: *Ash Ketchum* · runs on real hardware / any accurate GBC emulator.
---
## ✨ Highlights
- ⚡ **Fastboot** — got a save? Skip the intro, title, and CONTINUE menu and drop
straight into the overworld.
- 🎬 **Custom boot splash** — a real 2bpp *POKéMON · SL0P · EDITION* graphic.
- 🎛️ **The SL0P MENU** (**SELECT**) — a table-driven cheat menu: instant heal,
money, coins, badges, full dex, a maxed team, movesets, HMs, ×99 items, a
no-wild-encounters toggle, and a fly-warp to any town.
- 🗺️ **EXPLORE** — a free-flying overworld camera that **smooth-scrolls** across
the whole seamless Kanto map, gliding over map connections, and can **warp you
to wherever you're looking**.
- 💤 **SAVER** — a screensaver that puts EXPLORE on autopilot and drifts the
camera across Kanto on its own.
---
## 📸 Screenshots
<p align="center">
<img src="screenshots/demo.gif" width="320" alt="EXPLORE overworld camera demo"><br>
<em>the EXPLORE camera flying north across Kanto, then warping the trainer to the viewed tile</em>
</p>
| The SL0P menu | Fly-warp submenu |
|:---:|:---:|
|  |  |
| EXPLORE camera (▲▼◀▶ = where you can go) | SAVER screensaver drifting over Celadon |
|:---:|:---:|
|  |  |
---
## 🎛️ The SL0P MENU
Press **SELECT** in the overworld. Move the cursor, **A** to pick, **B** to back
out / close.
| Entry | Effect |
|-------|--------|
| **WARP** | fly-warp to any of 13 destinations (all towns + Route 4/10) |
| **HEAL** | full HP + clear status for the whole party |
| **MONEY** | ¥999,999 |
| **COINS** | 9,999 game-corner coins |
| **BADGES** | all 8 gym badges |
| **DEX** | mark every Pokémon owned + seen |
| **MAXTEAM** | whole party → Lv100, perfect DVs, maxed EVs, 999 stats/HP |
| **TEACH** | give everyone Hyper Beam / Earthquake / Ice Beam / Thunderbolt |
| **HMS** | give all five HMs (Cut/Fly/Surf/Strength/Flash) |
| **ITEMS** | ×99 of balls, Rare Candy, Full Restore, Max Revive, Max Elixer, PP Up + all five evolution stones |
| **NOWILD** | toggle wild encounters off |
| **REPEL** | refill repel steps |
| **EXPLORE** | free-flying overworld camera (see below) |
| **SAVER** | overworld screensaver (see below) |
### 🗺️ EXPLORE
A self-contained camera that flies over the **seamless Kanto overworld** with a
real hardware smooth-scroll — no character walking. The d-pad pans a screen at a
time and glides straight across map connections at the edges; **▲▼◀▶ arrows**
show which ways you can go. Press **A** to warp your trainer onto the tile you're
looking at, or **B** to return to the menu.
### 💤 SAVER
EXPLORE on autopilot: it keeps drifting in one direction until it hits a bound,
then turns and carries on, wandering across all of Kanto by itself. The arrows
and your trainer/Pikachu are hidden for a clean view. Press any button to wake it.
---
## 🛠️ Build & play
Needs [**RGBDS**](https://github.com/gbdev/rgbds) `v1.0.1` on your `PATH`
(`rgbasm` / `rgblink` / `rgbfix` / `rgbgfx`). See [INSTALL.md](INSTALL.md) for
toolchain setup.
```sh
make # -> pokeyellow.gbc (ship this one)
```
Load `pokeyellow.gbc` in any accurate Game Boy Color emulator (or flash it to a
cart) and press **SELECT** in the overworld. The build is reproducible; the boot
splash regenerates from `gfx/slop/intro.png`.
---
## 🧩 How it's built
Almost everything lives in a handful of files, chiefly **`engine/slop_menu.asm`**
(the SELECT menu + the EXPLORE/SAVER camera). Adding a menu entry is three lines.
The overworld camera reuses the walking engine's own smooth-scroll machinery
(`hSCX/hSCY`, the rotating VRAM map pointer, and the vblank row/column redraws) to
scroll pixel-by-pixel and stream map connections.
For the full technical write-up — the menu/handler dispatch, the smooth-scroll and
map-crossing math, the screensaver's wander logic, and the WRAM/ROM budget notes —
see **[SL0P.md](SL0P.md)**.
---
## 🙏 Credits
- Built on the **[pret/pokeyellow](https://github.com/pret/pokeyellow)** disassembly
— see [README.pret.md](README.pret.md) for the upstream project, and huge thanks
to the pret team and contributors.
- Pokémon is © Nintendo / Game Freak / The Pokémon Company. This is a
non-commercial fan project; **no ROM is distributed** — bring your own and build
from source.
|
