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Rats! is the easiest available common Challenge. It is composed of 5 fights against rat themed Creatures, and it takes place in a cellar/sewer.

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 14 804 84 28,244 252 254,036 560 1.254 M 2,100 17.64 M
2 Shadow Rat Shadow Rat 17 1,176 101 40,824 302 364,836 672 1.806 M 2,520 25.401 M
3 The Creten The Creten 20 1,620 118 55,716 352 495,636 784 2.458 M 2,940 34.574 M
4 Cunning Rat Cunning rat 23 2,136 135 72,920 402 646,436 896 3.211 M 3,360 45.158 M
5 Rodent from Hell Rodent from Hell 26 2,724 152 92,436 452 817,236 1,008 4.064 M 3,780 57.153 M

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 30 3,620 180 129,620 540 1.166 M 1,200 5.76 M 4,500 81 M
2 Shadow Rat Shadow Rat 36 5,204 216 186,644 648 0.186 M 1,440 8.294 M 5,400 116.64 M
3 The Creten The Creten 42 7,076 252 254,036 756 0.254 M 1,680 11.289 M 6,300 158.76 M
4 Cunning Rat Cunning rat 48 9,236 288 331,796 864 0.331 M 1,920 14.745 M 7,200 207.36 M
5 Rodent from Hell Rodent from Hell 54 11,684 324 419,924 972 0.419 M 2,160 18.662 M 8,100 262.44 M

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 60 14,420 360 518,420 1,080 4.665 M 2,400 23.04 M 9,000 324 M
2 Shadow Rat Shadow Rat 72 20,756 432 746,516 1,296 6.718 M 2,880 33.177 M 10,800 466.56 M
3 The Creten The Creten 84 28,244 504 1.016 M 1,512 9.144 M 3,360 45.158 M 12,600 635.04 M
4 Cunning Rat Cunning rat 96 36,884 576 1.327 M 1,728 11.943 M 3,840 58.982 M 14,400 829.44 M
5 Rodent from Hell Rodent from Hell 108 46,676 648 1.679 M 1,944 15.116 M 4,320 74.649 M 16,200 1.049 B

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 3,528 49.787 M 5,488 120.472 M 8,064 260.112 M 11,340 514.382 M 46,200 8.537 B
2 Shadow Rat Shadow Rat 4,234 71.707 M 6,586 173.501 M 9,677 374.577 M 13,608 740.71 M 55,440 12.294 B
3 The Creten The Creten 4,940 97.614 M 7,684 236.175 M 11,290 509.856 M 15,876 1.008 B 64,680 16.734 B
4 Cunning Rat Cunning rat 5,646 127.509 M 8,782 308.494 M 12,903 665.949 M 18,144 1.316 B 73,920 21.856 B
5 Rodent from Hell Rodent from Hell 6,352 161.391 M 9,880 390.457 M 14,516 842.857 M 20,412 1.666 B 83,160 27.662 B

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 7,560 228.614 M 11,760 553.19 M 17,280 1.194 B 24,300 2.361 B 99,000 39.204 B
2 Shadow Rat Shadow Rat 9,072 329.204 M 14,112 796.594 M 20,736 796.594 M 29,160 3.401 B 118,800 56.453 B
3 The Creten The Creten 10,584 448.084 M 16,464 1.084 B 24,192 1.084 B 34,020 4.629 B 138,600 76.839 B
4 Cunning Rat Cunning rat 12,096 585.252 M 18,816 1.416 B 27,648 1.416 B 38,880 6.046 B 158,400 100.362 B
5 Rodent from Hell Rodent from Hell 13,608 740.71 M 21,168 1.792 B 31,104 1.792 B 43,740 7.652 B 178,200 127.02 B

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 15,120 914.457 M 23,520 2.212 B 34,560 4.777 B 48,600 9.447 B 198,000 156.816 B
2 Shadow Rat Shadow Rat 18,144 1.316 B 28,224 3.186 B 41,472 6.879 B 58,320 13.604 B 237,600 225.815 B
3 The Creten The Creten 21,168 1.792 B 32,928 4.337 B 48,384 9.364 B 68,040 18.517 B 277,200 307.359 B
4 Cunning Rat Cunning rat 24,192 2.341 B 37,632 5.664 B 55,296 12.23 B 77,760 24.186 B 316,800 401.448 B
5 Rodent from Hell Rodent from Hell 27,216 2.962 B 42,336 7.169 B 62,208 15.479 B 87,480 30.611 B 356,400 508.083 B

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 60,984 14.876 B 78,624 24.726 B 99,372 39.499 B 123,480 60.989 B 201,600 162.57 B
2 Shadow Rat Shadow Rat 73,181 21.421 B 94,349 35.606 B 119,246 56.878 B 148,176 87.824 B 241,920 234.101 B
3 The Creten The Creten 85,378 29.157 B 110,074 48.465 B 139,120 77.417 B 172,872 119.538 B 282,240 318.637 B
4 Cunning Rat Cunning rat 97,575 38.083 B 125,799 63.301 B 158,994 101.116 B 197,568 156.132 B 322,560 416.179 B
5 Rodent from Hell Rodent from Hell 109,772 48.199 B 141,524 80.116 B 178,868 127.975 B 222,264 197.605 B 362,880 526.727 B

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 130,680 68.309 B 168,480 113.542 B 212,940 181.373 B 264,600 280.052 B 432,000 746.496 B
2 Shadow Rat Shadow Rat 156,816 98.365 B 202,176 163.5 B 255,528 163.5 B 317,520 403.275 B 518,400 1.074 T
3 The Creten The Creten 182,952 133.885 B 235,872 222.542 B 298,116 222.542 B 370,440 548.903 B 604,800 1.463 T
4 Cunning Rat Cunning rat 209,088 174.871 B 269,568 290.667 B 340,704 290.667 B 423,360 716.934 B 691,200 1.911 T
5 Rodent from Hell Rodent from Hell 235,224 221.321 B 303,264 367.876 B 383,292 587.651 B 476,280 907.37 B 777,600 2.418 T

Stage Creature Image I II III IV V
Level HP Level HP Level HP Level HP Level HP
1 Fetcher Rat Fetcher Rat 261,360 273.236 B 336,960 454.168 B 425,880 725.495 B 529,200 1.12 T 864,000 2.985 T
2 Shadow Rat Shadow Rat 313,632 393.46 B 404,352 654.002 B 511,056 1.044 T 635,040 1.613 T 1,036,800 4.299 T
3 The Creten The Creten 365,904 535.542 B 471,744 890.169 B 596,232 1.421 T 740,880 2.195 T 1,209,600 535.542 B
4 Cunning Rat Cunning rat 418,176 699.484 B 539,136 1.162 T 681,408 1.857 T 846,720 2.867 T 1,382,400 7.644 T
5 Rodent from Hell Rodent from Hell 470,448 885.285 B 606,528 1.471 T 766,584 2.35 T 952,560 3.629 T 1,555,200 9.674 T