| 7871 | Medals | 1/1 | |
| 7872 | Flipping colors | 1/1 | |
| 7873 | Point of view in Flatland | 1/1 | |
| 7874 | Moonshine | 0/1 | |
| 7875 | Cousins | 1/1 | |
| 7876 | Tautology | 1/1 | |
| 7877 | Humidex | 1/1 | |
| 7878 | Tour de France | 1/1 | |
| 7879 | Texas Trip | 1/1 | |
| 7880 | Pseudoprime numbers | 1/1 | |
| 7881 | Carpool | 1/1 | |
| 7882 | Gangs | 1/1 | |
| 7883 | Smeech | 1/1 | |
| 7884 | Tournament | 0/1 | |
| 7885 | Wedding | 0/2 | |
| 7886 | Trainsorting | 1/1 | |
| 7887 | Hot Spot | 0/1 | |
| 7888 | Balance | 1/1 | |
| 7889 | Laurel Creek | 0/1 | |
| 7890 | Rocket Stages | 1/1 | |
| 7891 | Logo | 1/1 | |
| 7892 | Cranes | 1/1 | |
| 7893 | WiFi | 1/1 | |
| 7894 | Exact Change | 1/1 | |
| 7895 | Dominos 2 | 1/1 | |
| 7896 | Logo 2 | 1/1 | |
| 7897 | Tic Tac Toe | 1/1 | |
| 7898 | Nice Prefixes | 1/1 | |
| 7899 | Convex Hull | 1/1 | |
| 7900 | Slalom | 1/1 | |
| 7901 | 输出N以内的素数 nprime [1*+] | 2/2 | |
| 7902 | Moveable maze | 1/1 | |
| 7903 | Pick up sticks | 1/1 | |
| 7904 | Digits | 1/1 | |
| 7905 | Rotate to root | 1/1 | |
| 7906 | Pipes | 1/1 | |
| 7907 | Cantor | 1/1 | |
| 7908 | Problem A: Egypt | 2/2 | |
| 7909 | Problem A: Bridges and Tunnels | 1/1 | |
| 7910 | Problem B: Octagons | 1/1 | |
| 7911 | Problem D: Numbersrebmun | 1/1 | |
| 7912 | Treasure Hunt | 1/1 | |
| 7913 | Art | 1/1 | |
| 7914 | KFC的长队-Z*W | 2/3 | |
| 7915 | 桐桐的计算 | 2/3 | |
| 7916 | 打印算式(suanshi) | 1/2 | |
| 7917 | 找数游戏(find) | 1/2 | |
| 7918 | 桐桐的砝码 | 2/3 | |
| 7919 | 蜜蜂路线(bee) | 2/3 | |
| 7920 | 取数游戏 | 2/3 | |