"This manual explains the use of z-Tree, the ""Zurich Toolbox for Readymade Economic Experiments"". No programming knowledge is necessary to use z-Tree. This software allows to program and to conduct a wide range of experiments. This includes simultaneous and sequential games as well as market experiments and posted offer markets or double auctions. Because many features needed in an experimental software are built into z-Tree (as data saving, time and period display, profit calculation, group matching, provisions in case of losses and bankruptcy), new experiments can be developed quickly and easily."