There is a war in Bukit Batok Avenue 8 between residents and rats.
These are no tunnel rats.
They are in your face and they have invaded HDB flats, with some even breaching the defences put up by families and shopkeepers.
The wily rodents have repeatedly outwitted humans and made their presence felt not just in dark alleys but in well-lit corridors and other areas as well.
Residents and shopkeepers are unsure how they are going to keep the rats out for good. Some have fortified their homes and shops. Others have built fences and set traps.
And there are those who have placed potted plants over fist-sized holes in grass patches surrounding Blocks 165, 166 and 167.
A first-storey resident of Block 165, who gave her name only as Madam Devi, 62, told The New Paper: "There have been more of them rats since November 2014. Sometimes, I see them in the day.
"From my window, I always hear their squeaks when they fight at night."
Madam Devi, who has lived there since 1984, said she occasionally replaces the acrylic board on the rear gate of her flat.
She had previously installed a board from inside her flat, but it did not stop a rat from entering.
Now, she secures the board from outside so that rats cannot nudge the board or climb the gate.
Her neighbour has also left a rat trap outside her flat.
Madam Devi said that over the years, she has seen pest controllers covering rat burrows behind her flat.
But the rats appear bolder now.
Ms Yvonne Ng, an incense shop retailer at Block 166, found that out for herself a few days before Chinese New Year.
She had been sitting at her desk in the shop and fiddling with her mobile phone when she noticed something near her legs.
"I didn't notice the rat until it passed between my feet," Ms Ng, 26, said.
"I jumped up from my seat and screamed. It ran into the shop and later escaped into a drain at the front of the shop."
She immediately borrowed a rat trap from a friend and placed it below some shelves in the shop. As bait, she used a piece of "huat kueh", or what is known as a prayer cake.
But she has had no luck so far.