The Riot 2015 Season Challenger Playoffs determine who will get automatically promoted into the LCS and who will join the Promotion Tournament.
- Top four Teams from the regular season
- Single Elimination
- All matches are Best of three, Finals are Best of five
- First place will be automatically promoted into the 2016 EU LCS Spring Season
- Second and third will qualify for the 2016 EU LCS Spring Promotion Tournament
- 2015 Summer Challenger Series Official Rulebook
- All matches played on patch V5.14 with Gangplank enabled.