How about dueling castles?
0~w_i:296.65,370|w_i:393.35,370|f_i:343.35,305|p_t:343.35,275|c_k:345,394.95|w_i:1165.05,361.6|f_i:1208.35,293.25|p_t:1208.35,265|c_k:1208.35,385|f_w:995,401.65|fs_w:1006.7,411.65|fs_i:1018.35,391.65|ws_i:945,-301.7|f_w:500,410|fs_i:480,400|fs_w:496.65,416.65|ws_i:551.7,-1203.35|ws_i:920.05,388.35|ws_i:578.4,393.25|f_w:646.7,-6210|f_w:874.35,-6210|ws_i:693.35,-7241.65|fs_s:611.7,-7251.65|ws_i:833,-9295|fs_s:910,-9301.65|p_t:745,391.65|p_s:321.65,-12111.7|p_s:340,-12118.35|p_s:368.35,-12138.35|p_s:391.65,-12586.7|p_s:356.65,-12256.7|p_s:326.65,-12235|p_s:380,-12265|p_s:398.35,-12261.7|p_s:1155,-14156.7|p_s:1176.7,-14200|p_s:1206.7,-14220|p_s:1225,-14253.35|p_s:1240,-14191.7|p_s:1221.7,-14150|p_s:1173.35,-14900|p_t:345,-16110|p_t:1201.7,-18166.7|w_i:1251.7,360|ws_i:1266.7,385|ws_i:383.35,-21258.35|ws_i:305,-21345|ws_i:351.65,-21358.35|ws_i:1176.7,-23293.35|ws_i:1216.7,-23315|ws_i:1253.35,-23366.7|
Although it might be too hard for the average player to participate.