Statistics Sheet - getting cumulative from many sheets

I have a spreadsheet that I created to track my sons basketball teams' stats.. for the past 2 years I have manually kept the "Cumulative" sheet up to date but I was wondering had another suggestion.. I use a new sheet for each game.. is there a way to have the Cumulative (Sheet 1) update automatically when I add a new sheet for a new game and enter the stats? I know I could use =sheet2!A1+sheet3!A1...etc.. but is there a better way? I have attached the spreadsheet I used for last season..

Thanks in advance!!

Kyle Snyder