Labour has handed the government nearly 1000 submissions from members of the public opposed to the deal that will give Sky City more pokie machines in return for building a national convention centre.

The submissions are responses to Labour's website campaign "show us your cards, John" - a challenge to Prime Minister John Key to disclose details of the negotiations between the government and Sky City.

Opposition parties oppose the deal and says the government is "selling legislation" in return for the $340 million convention centre in Auckland.

Labour says Sky City wants 500 extra pokie machines in its casino and is being offered 350.

The government won't disclose anything about the discussions.

"Polls show Kiwis are strongly opposed to any deal that will lead to more pokies and cause more harm to New Zealand families," Labour leader David Shearer said on Tuesday.

"John Key is refusing to accept those concerns - he may not be prepared to listen to Labour but he should listen to the people."