Adult Lego fans are blowing up after being banned from visiting a newly-opened Legoland Discovery Centre in Melbourne unless accompanied by a child.

The centre, which has 11 attractions specifically designed for children aged between 3 and 10, opened its doors to the public for the first time on Tuesday, according to Daily Mail.

But adult Lego lovers have flooded the centre's Facebook with negative reviews after being denied entry without kids - despite pre-purchasing tickets weeks in advance.

One adult fan was so incensed by the "disgusting" move on Lego's behalf that he took his complaint to the Victorian Equal Opportunity and Human Rights Commission.

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"Absolutely disgusted to hear that you will discriminate on grounds of age. Lego is something that is enjoyed across all the ages," one man wrote online.

"I personally have thousands of dollars worth of the Creator and Architecture series and it's clear that many adults without children will want to experience the attractions.

"I hope you've done your homework on this one because I will be making a complaint to VCAT if you knock me back on the grounds of age and I will encourage others to do so as well."

"Extremely disappointed to have purchased an annual pass at launch where they failed to state I needed to attend with a child," added another adult Lego enthusiast.

"Just got turned away at the preview opening. No phone number or contact for a refund. Just lost a lot of business."

Another fan raised the matter with VCAT (Civil and Administrative Tribunal), arguing that basing a policy on 'parental status' could be deemed discriminatory.

Adult fans vented their frustration on the centre's official Facebook page, flooding it with negative 1-star reviews. Photo/Facebook
Adult fans vented their frustration on the centre's official Facebook page, flooding it with negative 1-star reviews. Photo/Facebook

But Legoland Discovery Centre was quick to respond to formal complaints, stressing that many of the key features in the attraction were "not suitable for grown adults".

"LEGOLAND Discovery Centres are not theme parks but small, indoor attractions specifically designed to provide safe and fun environments for families with children aged 3-10 to enjoy together," a spokeswoman said.

"In order to constantly maintain a welcoming environment in which to play, the Centres do not permit entry to any groups of adults, adult couples, or lone adults, who are not accompanied by a young child or children."

The spokeswoman added that adult only evenings were held once a month to "balance the fact that grown adults cannot use many parts of the attraction".