Great job! I found the ONLY way to win in leaderboard events is to Yellow Boost. Like Judy said, have everything ready to go beforehand with as many things made as you can. You really can't focus on anything else when you're doing a leaderboard. They're generally the most expensive of any events as you must use gems for it. I usually purchase a gem pack to max out my chances of winning or getting second place. It's hard to know for sure if you're going to win even with boosts and gems. I've had players leap-frog me literally in the last few minutes after I thought I had won. Leaderboards are definitely the most difficult and stressful events but many times they have the best prizes. What to do? "shrugs"