Slope Y8
Press Play above and Slope Y8 opens in Y8's own player, with its menu, Login button and leaderboard.
What is Slope Y8?
Slope Y8 is the Y8.com version of Slope, the 3D ball game Rob Kay made in 2014. You steer a ball down a neon green track. The Credits screen reads "game by @RobKaySF", "music by @SynthR" and "published by @Y8.com".
| Game by | Rob Kay (@RobKaySF) |
|---|---|
| Music by | @SynthR |
| Published by | Y8.com |
| Dates | Kongregate: 14 September 2014. Y8: added 30 September 2014 |
| Keys | Arrow keys, A/D or Q/D |
| Account | Not needed (you play as Guest) |
Y8's Slope page showed about 149 million plays on November 12, 2026.
How to play Slope on Y8
- Press Play on the game frame. The Y8 player loads inside this page.
- Press Play in the Slope menu. The game starts you as Guest, so you need no account.
- Steer with the arrow keys, A/D or Q/D. The game shows this hint at the start of a run.
- Keep the ball on the track. It rolls forward by itself, and you only steer left and right.
We played two test runs on this page in Chrome on a desktop, in a window 1440 by 900 pixels, and pressed no keys in either. In the first, on November 12, 2026, the game showed "SPEED UP" about five seconds in. The number at the top of the screen went from 0 to 1 when the ball dropped onto a new section of track. Then the ball rolled off the edge and fell, and the end screen came up about 11 seconds after the start. The second run, on November 13, also showed "SPEED UP" and reached 1, then ended at a red block on the track. We also tried this page on a phone: the game runs there, but it is hard to play.
Y8 describes the score this way: "The longer you survive, the higher your score." Its description also tells players to avoid the red obstacles.
Y8 leaderboard and Slope100 scores
The Leaderboard button in the game opens a leaderboard inside the Y8 player, with an All time view of player names and points.
Scores from this page do not reach the Slope100 leaderboard. To get on that board, play on the Slope100 home page, which runs another version of Slope. The full list is on the Slope100 high scores page.
Slope Y8 and the Slope100 home page version
The two pages run different builds of Slope. We checked both on November 12 and 13, 2026.
| Slope Y8 (this page) | Slope100 home page | |
|---|---|---|
| Game files come from | y8.com, in Y8's player | slope100.com |
| Menu buttons | Login, Play, Credits, Leaderboard, Feedback, download | PLAY, SETTINGS, LEADERBOARD |
| Key hint at the start | "steer with arrows, a/d, or q/d" | "STEER WITH ARROWS OR A/D" |
| Credits screen | Yes: Rob Kay, @SynthR, Y8.com | None |
| Your name in the game | Guest, with a Login button | A random name such as PLAYERWYUZF |
| Where scores go | Y8's leaderboard inside the player | The Slope100 leaderboard next to the game |
Slope Y8 FAQ
Who made Slope on Y8?
Rob Kay made Slope. The Credits screen in the game on this page reads "game by @RobKaySF", "music by @SynthR" and "published by @Y8.com". Y8's own Slope page lists Y8 Studio as the developer.
Is Slope Y8 free?
Yes. Y8 lists Slope as free to play in the browser. On this page the game starts you as Guest, so you can play without an account.
What keys do you use in Slope Y8?
The game's hint says to steer with the arrow keys, A/D or Q/D. The ball rolls forward on its own, so you only steer left and right.
Where can I play Slope Y8?
On this page. Press Play and Y8's own player loads in the frame at the top. The Slope100 home page runs another version of Slope that has the Slope100 leaderboard.
What is the game with the green ball?
Slope is one game that fits. A black ball drawn in green wireframe lines rolls down a neon green track, as the screenshots on this page show.
Is there a Slope Y8 app?
The Y8 game has a "download" button with the Google Play logo in its menu and an "Android app on Google Play" badge on its end screen. This page plays the browser version.
Do Slope Y8 scores count on the Slope100 leaderboard?
No. This page runs Y8's player, and its scores do not reach the Slope100 leaderboard. To get on that board, play on the Slope100 home page.
Is Slope100 the official Y8 site?
No. Slope100 is an unofficial site run by PLAY100 and is not affiliated with Rob Kay or Y8. The game on this page uses the embed code that Y8 publishes on its Slope page.
Written and tested by Slope100, a PLAY100 site. Last checked: .