The DDC is an internal system developed by the University of Minnesota Chemical Waste Registry Searchable Database to classify substances through a two-part designation code: the Hazard Class and the Disposal Type. For example, if a substance has a DDC of 02LI then it is a liquid inorganic acid.

With the Time Bonus, free chips are stacking up, just waiting to be collected. Collect as often as hourly, or let several hours’ worth stack up to collect all at once. If you have an active Booster, your Time Bonus can stack up four times; without a Booster, the Time Bonus stack maxes out at three.

The DDC is an internal system developed by the University of Minnesota Chemical Waste Registry Searchable Database to classify substances through a two-part designation code: the Hazard Class and the Disposal Type. For example, if a substance has a DDC of 02LI then it is a liquid inorganic acid.

On desktop, your Time Bonus is at the top right in the main lobby. In this image, there is one stack available to be collected, and the timer indicates a second stack will be available after 46 minutes and 43 seconds.

The Dewey Decimal Classification (DDC) system is a general knowledge organization tool that is continuously revised to keep pace with knowledge. The system was conceived by Melvil Dewey in 1873 and first published in 1876. The DDC is published by OCLC Online Computer Library Center, Inc.