For physical discs, just push them straight in and wait for them to boot up.
Digital Xbox 360 games will appear in the 'My Games and Apps' section of your UI and you can simply download them again.
The achievement-tracking site True Achievements counts 150 new achievements worth a combined 2,780 Gamerscore (one is, delightfully, "Do You Have Battletoads?
" offering 15 Gamerscore simply for playing that game.) More remarkably, Thomas says the save files from Rare's previous Xbox 360 titles (Viva Pinata and Perfect Dark Zero are two) can be transferred to the Xbox One collection.
You will be able to purchase supported Xbox 360 games on the Xbox One store.
The long-awaited, fan-requested feature allows gamers to dust off their back catalogue of Xbox 360 games and despatch their last-gen console to the attic along with their PSP and the ghost of a Sega Megadrive that quietly moans in the corner.
They are not tracked separately per world; achievements earned in one world apply to all worlds using that edition and that user account.
They are independent of one another, allowing players to get them in any order. Achievements/trophies can only be earned in Survival mode.
That's why we thought we'd put together a handy guide on what you can expect when the March update hits your console.
Although we're not completely sure when the update will arrive on general release - sometime in March, but not an exact date - we do know that Xbox One Preview members will get the update today, 1 March.