Can I still play old Flash games?

Yes, through emulators. The open-source Ruffle project re-implements the Flash runtime and runs in the browser without any plug-in. The Internet Archive hosts a large preserved Flash library that uses it.

Are .io games still popular?

Several of the originals (Slither.io, Agar.io) remain active with steady player bases, although the broader .io wave has settled. The format is still good for casual, instant multiplayer.

What replaced Kongregate?

No single site has taken its place. The audience scattered: casual players moved to Poki and CrazyGames, indie fans went to itch.io, and many original Kongregate developers shifted to Steam or mobile.

Browser games

Browser games are titles you can play directly in a web browser, without downloads or installs. After the end of Flash in December 2020, the field went through a difficult transition — but it survived, and today HTML5 and WebGL host a thriving free-game ecosystem.

Life after Flash

Adobe officially discontinued Flash Player on 31 December 2020, and major browsers blocked it shortly after. For a decade and a half Flash had been the default delivery format for free browser games — from Newgrounds shorts to Kongregate full-length titles. When it disappeared, an enormous catalogue went dark overnight.

Replacement technologies were already maturing: HTML5 Canvas for 2D, WebGL for accelerated 3D, and the Web Audio API for sound. By the mid-2020s, frameworks like Phaser, PixiJS, Three.js and Unity’s WebGL export had filled the gap. Many classic Flash titles were rewritten in HTML5; others were preserved via the open-source Ruffle emulator. The Internet Archive’s Flash Library hosts thousands of old games for archival purposes.

The .io wave

Around 2015 a new sub-genre emerged with Agar.io — lightweight, multiplayer, instant-join browser games on cheap .io domains. Slither.io (2016) and Krunker.io (2018) followed, alongside hundreds of imitators. The formula: open a URL, get a name, join a server, play for two minutes, leave. No account required.

The .io style is still healthy in 2026, although the gold rush has cooled and most successful titles have either grown into proper apps (Slither has an iOS / Android version) or quietly shut down. The genre’s appeal — zero friction, low system requirements, casual social play — is durable.

Major platforms today

itch.io — the indie home. Many submissions are browser-playable, especially game-jam entries. Pay-what-you-want pricing, often free.
CrazyGames, Poki, Y8 — ad-supported HTML5 portals, similar in spirit to the old Kongregate / Miniclip model. Curated catalogues, casual focus.
Newgrounds — still active, now HTML5-only, with a strong community-creator culture.
Steam “Play in Browser” — a small number of Steam titles offer browser builds, mostly demos.
Internet Archive Flash Library — archival access to old Flash titles via the Ruffle emulator.

Kongregate, once the genre’s biggest hub, stopped publishing new games in 2024 and now functions as an archive only. Miniclip pivoted entirely to mobile.

Categories of browser game

Arena / .io — multiplayer skirmish games (Slither.io, Agar.io, Diep.io).
Puzzle — logic, word and match games. Often very polished (Wordle, the New York Times daily puzzles).
Idle / clicker — games that progress whether or not you are looking at them (Cookie Clicker, Universal Paperclips).
Card — from solitaire to digital trading-card games and roguelike deckbuilders.
Narrative — interactive fiction, often built with Twine or Ink. itch.io has a large catalogue.
Retro / emulated — archives of historic arcade and home-computer titles, accessed legally for preservation.

Performance and compatibility

Modern HTML5 games run smoothly on virtually any device with a recent browser. WebGL 2 is standard, and the experimental WebGPU API is now shipping in Chromium and Safari, opening the door to more ambitious 3D titles. On lower-end hardware, performance is usually limited by the device’s integrated graphics rather than by the browser itself.

Frequently Asked Questions

Can I still play old Flash games?: Yes, through emulators. The open-source Ruffle project re-implements the Flash runtime and runs in the browser without any plug-in. The Internet Archive hosts a large preserved Flash library that uses it.
Are .io games still popular?: Several of the originals (Slither.io, Agar.io) remain active with steady player bases, although the broader .io wave has settled. The format is still good for casual, instant multiplayer.
What replaced Kongregate?: No single site has taken its place. The audience scattered: casual players moved to Poki and CrazyGames, indie fans went to itch.io, and many original Kongregate developers shifted to Steam or mobile.