Lifesaving Shovel (スコップ一つに) is the final stage in The Gelatin Mines. Urs & Fenrir and Croconator are introduced in this stage. When clearing the stage, you have a 3% chance to unlock Urs & Fenrir. This is a No Continues stage.
Battleground
- 400 Croconators spawn after 0 seconds0f delay 8~12 seconds240f~360f.
- 1 Urs & Fenrir spawns as the boss after 3.33 seconds100f.
- 8 Croconators spawn after 5 seconds150f, delay 2~4 seconds60f~120f.
- 3 Rain Ds spawn after 26.67 seconds800f, delay 80 seconds2,400f.
Strategy
The use of units with more than 500 range is highly recommended.
Strategy 1 (cheese)
The easiest way to beat this stage is to exploit the weak peons and the enemy limit, although it requires decently high levels or rare units.
Lineup: some Combos that increase the health of the base, 1-2 meatshields, Golfer Cat and some other units with Long Distance and either an ability that targets Relics or good damage. Good Luck Ebisu, Chronos and A. Mina are some examples, although about any LD uber does the job. Headmaster Cat Jobs is a risky Choice, as he could kill the Croconators if the surge hits them too many times, but could work with some luck; either way, it's not recommended.
Battle: Do not use the meatshields, instead, forget they exist for now. Start by doing nothing until all Croconators are attacking the Cat Base. Once that happens, start stacking the Long Distance attackers. What should happen is that these units will let Urs attack the base, but they will also knock her back and keep her there. After a while, the damage will build up as more units are added, thus preventing Urs from ever attacking again and killing her after a short while. The next step is to either wait there and do the same to the Rain D. trio or to advance and use the meatshields to block them and fight them normally. Once they are gone, the meatshields will quickly clear the enemies until the LD attackers can reach the enemy base and destroy it.
Strategy 2
Lineup: Sportswomen Combo, Bony Bone+Biohazard or an alternative, Ramen Cat (50+16/max defense up), Bullet Train Cat (50), Awakened Bahamut Cat (40), Cyberpunk Cat (40+1), Sniper the Heavy (True Form not used, but recommended; row 2, as combo is not needed).
In place of Sniper the Heavy or A. Bahamut, the use of eventual Uber Rare Cats with amazing range is recommended, but it is far from necessary.

Battle: Wait for the boss wave by upgrading the worker once; after it happens, summon Ramen and spam it for the rest of the fight, just a bit less often to spare money if Urs is yet to be reached. Next step is to summon Cyberpunk, then Sniper the Heavy. For the whole fight, Ramen will take care of the Croconators while the 2 backliners help preventing the enemies from advancing, but that isn't going to be enough when 3 Rain Ds stack, so the use of Bullet and Bahamut is mandatory. Make sure that Urs is attacking and no Croconator is about to get in the way when spawning one of these rushers, then use the cannon to allow Bahamut to deliver a second hit. This way, each Rain D. will die shortly before the one after the next is summoned, so all three should never stack. Eventually, you'll stack enough Cyberpunks and Snipers to push the boss close to the base, where they'll easily die, granting you a victory.