Loopable music for a game

Hi to all people, i'm a 30 year old computer based musician who has find in REAPER simply the best DAW out there for his versatility, speed of use, costant support and lot of great functions. Sometimes i use this beast in conjuction with PLOGUE BIDULE for bizarre sound-design experiments... Now the question: a friend of mine has asked me to write a simple tune (30-40 sec.) for a puzzle-game and it has to be perfectly loopable with no fade-in/out. So, there is a sort of WRAP REMINDER export function (present in Fruity Loops/Studio for example) that give me a perfect loopable file? Thanks for your answers!

When you render your song, you can select to render a selection only if you wish. [File>Render>Render Time Selection] You could then make your selection fit your required loop precisely. That's if I've understood you correctly! :)

Daytwa has centered the problem, but i've found that the WRAP REMINDER is easily replicable in REAPER: is sufficient to rendering the project with is tail, split the final at point desidered and move the same tail fragment to the beginning of the song (and eventually in another track) without fade-in. Then re-render. But now you have lost your 'dry' intro ('cause begins with the tail effect) and gained the seamless loopable feature... The real dilemma is that probably my structure/arrangement isn't loopable and i have to modify it... @dub3000: the little game is intented to be for iPhone (i don't know anything about this device)...