After narrowly losing in her first appearance in Series 47, Mills returned for her second debut in early 2015, as part of Series 72. Despite falling behind in her first game against fellow apterite Neil Stephenson, she found the 9 letter word FEATURING late on to secure a century. Five more centuries followed in her octorun, including in her last game against Wendy Cooke, where she held her opponent to the lowest ever 15-round score on Countdown.
Mills entered the finals as No. 3 seed, and despite a nervous start to her quarter-final, defeated Jordan Barker and proved too strong for No. 2 seed Gerry Tynan in the semi-final to set up a clash with No. 1 seed Tom Cappleman. Despite taking an early lead with BEACONS, Mills fell behind after the first numbers. While keeping Cappleman in her sights, she was unable to force a crucial conundrum and ended the series as runner-up.
Mills returned in 2016 for Championship of Champions XIV. In the first round, she was given a tough draw against multiple-record holder Dylan Taylor. Here, Mills demonstrated excellent knowledge in a tough mix of letters and numbers rounds, but made the two unfortunate offerings iodcrase ☓ and servuga ☓, both of which were very slight misspellings of valid words spotted by Taylor and by Dictionary Corner. The Series 69 runner-up went on to score in every round and emerge the victor by 120 – 73.
She made her Co-event debut at COHUD and CoChest2 in 2012. She has also appeared in the Countdown audience numerous times as the conundrum solver, and owns 7 Countdown mugs, probably than anyone else.
Mills competed in the 2018 FOCAL Finals as the #3 seed, and finished in 7th place, winning 2 out of 7 games.
|#||Date||Type||Contestant 1||Score||Contestant 2||Guest||Lex||Max|
|3165||11/01/2002||P||Jeremy Slaney||81 – 77||Tracey Mills||Don Black||Richard Samson||137|
|6069||21/01/2015||P||Neil Stephenson||83 – 104||Tracey Mills||Tim Wonnacott||Susie Dent||133|
|6070||22/01/2015||P||Tracey Mills||101 – 25||Sean Chenery||Tim Wonnacott||Susie Dent||142|
|6071||23/01/2015||P||Tracey Mills||97 – 37||Keith Taylor||Tim Wonnacott||Susie Dent||121|
|6072||26/01/2015||P||Tracey Mills||109 – 59||Mickie Wynne-Davies||Helen Skelton||Susie Dent||146|
|6073||27/01/2015||P||Tracey Mills||107 – 69||Gary Coroner||Helen Skelton||Susie Dent||121|
|6074||28/01/2015||P||Tracey Mills||116 – 58||Daniel Rhymer||Helen Skelton||Susie Dent||127|
|6075||29/01/2015||P||Tracey Mills||98 – 77||Martin McConachie||Helen Skelton||Susie Dent||119|
|6076||30/01/2015||P||Tracey Mills||104 – 6||Wendy Cooke||Helen Skelton||Susie Dent||122|
|6152||8/06/2015||QF||Tracey Mills||99 – 66||Jordan Barker||Jo Brand||Susie Dent||158|
|6155||11/06/2015||SF||Gerry Tynan||89 – 101||Tracey Mills||Jo Brand||Susie Dent||124|
|6156||12/06/2015||GF||Tom Cappleman||107 – 89||Tracey Mills||Jo Brand||Susie Dent||126|
|6281||7/01/2016||CP||Dylan Taylor||120 – 73||Tracey Mills||Gloria Hunniford||Susie Dent||124|