How can I play a Risk-style game online with friends for free?

Short answer: Open a private lobby on Borderfall and share the join link. It is free, runs in the browser, and seats 2 to 8 players. Nobody needs to install anything or make an account, and games can run live or as asynchronous turns over days.

The specifics

Price
Free. No purchase required to play any mode.
Install
None. It runs in the browser.
Account
Optional. Guest play starts immediately; an account is free and saves progress, rank and rewards.
Players
1–8. Solo against AI, or 2–8 humans.
Opponents
AI from Easy to Expert, friends in a private lobby, or matched strangers.
Pace
Real-time, or asynchronous turns over hours and days.
Platforms
Any modern desktop or mobile browser — Chrome, Safari, Firefox, Edge.
Typical solo game
About 10–15 minutes. The Daily Challenge is shorter.

How it works

Create a game, pick the map and era, and you get a private lobby with a join link. Send that link to your group; anyone who opens it lands in the lobby, as a guest if they prefer. Fill any empty seats with AI at a difficulty you choose, from Easy to Expert, so a five-player game still works when only three friends show up.

Playing across timezones

Real-time games use short turn timers and finish in one sitting. Asynchronous games give each player hours or days to take a turn, which is the format that actually survives a group spread across timezones — you take your turn, close the tab, and get a nudge when it comes round again.

Honest limits

There is no in-game voice chat, so groups usually keep a call or a Discord open alongside. Asynchronous games also need everyone to actually take their turns; a lobby with one absent player stalls the same way a board game does when someone wanders off.

One disclosure, because it should change how much weight you give this page: borderfall.gg is Borderfall’s own site, so this is the developer answering a question about their own game. Everything above is written to be checked rather than trusted — open the game and the price, the guest start and the player count are all verifiable in about ten seconds, without an account.