OpenTennis

OpenTennis — a remaster of Hot Shots Tennis (PS2)

A from-scratch rewrite of the PlayStation 2 game Hot Shots Tennis (US, 2007), known as Everybody's Tennis in Europe and Minna no Tennis (みんなのテニス) in Japan, in Rust with the Bevy engine. The goal is the same game: the same ball physics, rules, timing and AI, ported from the original and checked frame by frame against the real game, with better rendering on top.

Play in your browser: https://opentennis.dev (you pick your own ISO; nothing is uploaded).

Newest unreleased build (every change to main, less tested): https://beta.opentennis.dev.

Download for Windows, Linux, Android or iOS: latest release.

Work in progress. Building from source, modding by hand and development: docs/DEVELOPING.md.

Screenshots

Taken from the remaster running on a retail disc (the art comes from the disc; none of it is in this repository).

You must provide the game disc

This repository contains no game data: no models, textures, animations, sounds, music or program code from the original. Everything the game shows or plays is read at runtime from your own copy of the disc. Without it, nothing runs.

What you need:

Disc	Hot Shots Tennis, US release, version 1.00, serial SCUS-97610 (PS2)
Format	A disc image (.iso) you made from a disc you own
Where	Anywhere; the game asks for it the first time (the browser keeps it in private storage, nothing is uploaded)

• Other regions don't work. Everybody's Tennis (Europe), Minna no Tennis (Japan) and other versions have different program data. The game checks the disc (SYSTEM.CNF boot file SCUS_976.10 and the size and header of ZZBIN/GAME.BIN) and refuses anything else with unsupported disc.
• Don't ask for, share or commit disc images or anything extracted from them. Nobody here can provide one.
• You don't need a PS2 BIOS, an emulator or any other files to play. Those are only for the research tools (see docs/DEVELOPING.md).

What works, what's missing

Plays like the original (checked against recordings of the real game, frame for frame): ball flight, spin, bounces and the court, net, walls and props it hits; every shot (topspin, slice, lob, flat, drop, smash, serve), timing grades and each character's own shot data, reach and dives; the CPU players in singles and doubles; line calls, scoring, change of ends and the timing between points; weather and the courts' moving creatures.

Ours, made to look and feel right: rendering (any resolution and aspect ratio, uncapped frame rate, upscaled texture packs), menus, settings, online play with rollback, touch controls, character/court/umpire/texture mods.

Not there yet:

• The original's second match camera, Set Handicap and Offbeat Rules.
• Let serves aren't proven against the real game yet.
• Shadows are sharper than the PS2's in the "Original" look.

The open list is plan/TODO.md; how it's made and what it's built on: CREDITS.md.

Controls

Player 1 uses the keyboard or the first controller. In doubles, a second controller plays player 1's partner (P1 + P2 vs 2 CPUs); in singles it plays the opponent. Every other player is a CPU.

Action	Keyboard	Controller
Move (aim while swinging)	WASD	Left stick / d-pad
Topspin	J	A
Slice / Serve	K	B
Lob	L	Y
Drive	U	RB
Swap hand (character select)	C	Select

Mods

Main menu → Mods adds characters, courts and umpires from the store (FIZL0/opentennis-mods), on desktop and in the browser.

• Browse mods: pick one to install it.
• Upload my mod: sign in with a Hugging Face Write token, then pick a mod to upload. It shows as Not reviewed until merged.
• Made your own? Put its folder (mod.json + .glb files) in mods/<id>/ in the game's data folder (~/.local/share/hst, %APPDATA%\hst, ~/Library/Application Support/hst); it shows in the game and in Upload my mod. How to make one: opentennis-mods.

Texture replacements: texture packs (a mod whose mod.json says "kind": "textures"; several stack in an order) and mods/texture-replacements/ replace the disc's textures, a PCSX2 texture pack made for the original game works as is, and mods can carry upscaled textures of their own (the "Texture Replacements" setting). How to make either: docs/DEVELOPING.md.

Online play

Main menu → Online. Up to four players, singles or doubles; the computer plays any open seat. Browser, desktop and phone players can all play together.

• Host opens a lobby with a 4-letter code. Public lobbies are listed in Find and picked up by Quick play; Private ones only take the code or link.
• Join takes the code, or the host's copied link (opening the link joins too).
• Players connect directly where they can; otherwise traffic goes through a relay (iroh's public ones by default, or your own: Online → Relay → Custom...).
• Codes are looked up through our code server, pkarr.opentennis.dev. If it's down the game switches to the public relay.pkarr.org by itself; that one is rate-limited per network, so a house full of players can hit "no answer".

Same network, no internet (Relay → Off):

• Desktop and phone apps find each other's lobbies in Find.
• Browsers can't see the local network, so there's no code: the host copies their link (Copy link) and sends it; the guest opens it or taps Paste in Join by Code, then copies their own link back, and the host taps Paste in the lobby. On iOS Safari, tap Paste a second time if it asks.

Host your own servers. Nothing is required, but you can run both servers yourself:

• Code server (short codes, Find): tools/pkarr-relay/ has a Docker Compose file (works as a TrueNAS custom app) and an nginx config. Put it behind HTTPS on your domain, then add code_server = https://your.domain to online.txt in the data folder on each player. Codes go into the same public DHT either way, so players on different code servers still find each other.
• Relay (traffic when a direct path fails): iroh-relay, see docs/DEVELOPING.md. Every player in a lobby needs the same relay.

More (settings file, terminal client): docs/DEVELOPING.md.

License

The code is licensed under either of Apache License 2.0 or MIT, at your option. This covers the code only, not the game or its data.

Legal

This is an unofficial fan project, not affiliated with or endorsed by Sony Interactive Entertainment or Clap Hanz. Hot Shots Tennis, Everybody's Tennis and Minna no Tennis are trademarks of their owners. No copyrighted game data is included or distributed. You must own the game to use this.