Prickly Field is the first stage in Bamboo Island.
In your lineup, equip typical anti-red cats, including ones that can slow, stop, etc. as you are going to face the Bore (Red.) When the battle starts, gain money by sending out a few Wall Cat to stall the enemies. When you have a wallet that is at least level 5 or maxed that is nearly full, send out Bahamut Cat along with Macho, Wall, and Brave cats. If you can, send out Dragon and Sexy Legs just to be safe. Once the base takes enough damage, the Bore should appear. Keep sending out Macho, Wall and Brave to stall the bore, along with ranged attackers. By now, you should've beaten the Bore and now you can freely attack the base and win.
If you possess Pirate Cat this should be a fairly easy battle. Start of by stalling the Gory's as long as you can with Tank cat and Macho cat. Keep stalling until you can afford the Bahamut Cat. Keep protecting the Bahamut Cat as he slowly pushes. Start sending out Pirate cats. One you have a fair amount of money send out everything you have pushing to the base.
(Recommended you bring long range cats like Sexy legs, Dragon cat and Paris cat) Keep attacking the base, remember to send out Pirate cat as soon as you can. Once the bore appears he should be getting knocked back every few seconds, not even giving him a chance to hit.