kohanson SG You will increase your level for every 5 Human battles you have won. From level 1 – 11 ur level will increase without decreasing. After level 11 whhich is when you got the flame on your car, ur level can decrease anytime by losing any matches with other human players.
kohanson SG for the stars: 1. Complete Story Mode once (Max 6 Stars) 2. Play Bunta Mode (win 1 game in each of the 4 tracks - 1 star, max 10 stars) 3. Win 5 games in a Battle (1 star, Not sure about the max)