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This is a long shot but I'm really in need of help for this because it was an amazing book. It was either a kid's or YA book. A guess from what year it was published would be 90s-mid 2000s, as I read it around 2008-2011.
- The book cover was in first person view, with the main character holding a weapon, and was a 3D rendered image inside a dungeon or cave (that was very reminiscent of early 90s CGI animation), though there may be variants.
- It would have been set around when computer games were mainstream (maybe around the same time as when it might've been published) It's about a teenage boy who is bored at home, so he looks through an old family computer to play a game and finds one that he has never seen before. When he plays it he gets transported into the game which is a fantasy-medieval setting.
- All that I can remember about the game and story is that the main character is on a quest, he rides horses a lot, (to the point where he can ride horses perfectly in real life), at one point he eats food at an ingame tavern/restaurant? and he tosses the ingame coin currency at the server because he's in a hurry, (don't know why I remember that bit specifically haha), and he meets a gnome/dwarf character who is helping him on his journey, who has a home in an ingame mountain, and that time goes faster in the game. (For example, if he spent 5 minutes in the real world, 3 in-game days would have passed)
- Sometimes as he's playing something stops him from being able the play the game for a few weeks, maybe a concerned parent because he's playing too much or there's a family vacation. I remember during the time when he's not playing the game he's on a farm and knew how to ride the horses there.
There was a character in the real world who was the main character's sibling, relative or friend. They were like a rival and was also very whiny (to some extent). They were on the farm as well with him and questioned how the main character knew how to ride a horse when he had never done it in real life.
This is all I can remember but if you need more specific information I can try and answer. It is definitely not Space Demons or Demons Don't Dream. If anyone knows anything remotely similar please mention it, I would really appreciate it. Thank you!!