You can essentially buy one Diet Coke (450mL) and get the rest (450mL or 600mL) free.
No Coke Unleashed tokens are required for this deal.
All you need to do is submit a Coke Unleashed code from any 450mL, 600mL, 1.25L, 1.5L or 2L bottle of "Diet Coca-Cola".
You'll be credited 10 tokens AND be able to "select a mood" then receive a prize.
Prizes for moods (ranging from $0.99-$9.99 in value) are as follows:
|Chilled||1x Video Ezy New Release Rental||$7.95||Email voucher||30 days or 30th July|
|Thirsty & Parched||1x 450mL Diet Coke||$3.87 RRP||Email voucher (7-Eleven/On the Run/Ausfuel/Gull)||30 days or 30th July|
|Fresh & [Thirsty/Parched (TAS)]||1x 600mL Diet Coke||$3.99 RRP||Email voucher (Priceline)||30 days or 30th July|
|Spontaneous, Cheeky & Flirty||1x red or pink nail polish or a pair of stud earrings||$7.99 (red); $8.99 (pink); $9.99 (earrings)||Email voucher (Diva)||30 days or 30th July|
|Hungry & Peckish||1x Nando's Mini Pita or Nando's Mini Burger||$4.50 (Pita); $4.95 (Mini burger)||Email voucher (Nando's)||30 days or 30th July|
|Inspired, Chuffed, Playful, Nervous, Chirpy, Creative & Fragile||1x Sims 3, Bejewelled, Monopoly, The Game of Life, Tetris, Peggle, or SimCity Deluxe (you pick!)||$0.99-$7.99||Mobile game (Apple, Android or Java-enabled devices only)||31st December|
|Electric, Bubbly, Rowdy, Mellow, Loopy, Frazzled & Giddy||3x EMI music tracks (random; see T&Cs)||$6.57||Code for EMI site||31st December|
Note: For a lot of the vouchers, it looks like you need to hand over your bottle code as well.
Also note: ANY code from a Diet Coke bottle - this promotion or otherwise - will work. However, note that the cashier might ask for you code with the required mood.
Full terms and conditions (including detailed prize information) here