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Lottery is closed. Do not buy tickets.

The rules are simple.
The ticket costs 10 NXT. This is how you buy it.
Open the Send NXT form, type in Recipient account NXT-YXC4-RB92-F6MQ-2ZRA6

10 NXT for Amount, click on Add a Message, in the Message field write 5 comma separated numbers from 0 to 30, numbers can be in any order. Example:
5,12,0,30,27

Check off the Encrypt Message box, the message must be publicly visible on the blockchain for transparency.
Click Send and your registration for the next lottery is completed.

DO NOT SEND FROM EXCHANGES!

Lottery will run every week, on Sunday, 18:00 UTC.

5% of the funds goes to service transaction fees. Surplus funds left after tx fees will be donated to the Lucky node lottery jar. This is a non profit project. All incorrectly formatted payments and payments of less than 10 NXT are considered donations and will go straight to the Lucky node lottery jar. If you lose in the lottery you still win supporting Nxt

Entire funds since last lottery are always paid to winners, less 5% service fee, less incorrectly formatted transfers. No jackpot funds held in the account, very simple accounting.
60% goes to who will guess all 5 numbers correctly.
25% - 4 numbers.
15% - 3 numbers.
There will be winners in each lottery, because the lottery will generate thousands of 5-number sequences to simulate thousands of participants until at least one combination matches the combination from one or more tickets. The order of numbers is not important. There can be several winners for each of 3,4,5 combinations in one lottery, but it can be predicted that for 4,5 combinations the odds of getting more than 1 winner are pretty low. If there are several winners, the prize is split between them, for instance, the 3-number 15% prize is split in two if there are two winners, each getting 7.5%.

A winning ticket is removed from the following rounds: ticket(s) that won in round of 5 will be removed from playing in rounds of 4 and 3, ticket(s) that won in round of 4 will be removed from playing in round of 3.

Prizes are paid instantly around 18:00 UTC, Sunday.

How To Verify Lottery Results.

# Install and sync Nxt client, run it on localhost, script talks to localhost anyway.
# Add nxt.apiServerEnforcePOST=false to nxt.properties (remember to remove it afterwards).
# Download the Lottery script v0.3 by NXT-8HJQ-DJ6Q-GBN8-G4A8G uploaded in block 924885 from Nxt Data Cloud (check that you do not run malware uploaded by someone else).
# Install php with curl and json.
in Ubuntu 14.04: apt-get install php5-cli php5-json php5-curl
in Ubuntu 16.04: apt-get install php7.0-cli php7.0-json php7.0-curl
In Windows: download and install PHP from http://windows.php.net/download#php-7.0 (not sure if windows binaries have curl and json extensions enabled, you'll need to figure it out on php support forums).
in Mac: http://php.net/manual/en/install.macosx.php
# get the seed for the lottery you want to verify, it is included in prize payout attached messages or look up the id of the block generated 10 blocks before Sunday 18:00 UTC and take 5 last digits from it, this will be the seed. Due to network latency and blockchain reorgs sometimes this block will be 11 blocks before 18:00 UTC.
# run the verification like this: php lottery.php seed yyyy-mm-dd
For example, the first lottery seed is 46850 from block 914773, date of the lottery 2016-08-14
php lottery.php 46850 2016-08-14

There are some edge cases in which the current script may act weird, but nothing serious.

Disclaimer:
Gambling is addictive. Spend only what you can afford to lose. A better form of gambling is trading. In trading you make an educated bet, in lottery your bet is mere luck. Personally I don't play in lotteries.