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We introduce version 2.0 of $Z'$-explorer, a software tool which provides asimple, fast and user-friendly test of models with an extra $U(1)$ gauge boson($Z'$) against experimental LHC results. The main novelty of the second versionis the inclusion of missing energy searches, as the first version only includedfinal states into SM particles. Hence $Z'$-explorer 2.0 is able to test darkmatter models where the $Z'$ acts as an s-channel mediator between the StandardModel and the dark sector, a widespread benchmark employed by the ATLAS and CMSexperimental collaborations. To this end, we perform here the first publicreinterpretation of the most recent ATLAS mono-jet search with 139 fb$^{-1}$.In addition, the corresponding searches in the visible final states have alsobeen updated. We illustrate the power of our code by re-obtaining public plots,and also showing novel results. In particular, we study the cases where the$Z'$ couples strongly to top quarks (top-philic), where dark matter coupleswith a mixture of vector and axial-vector couplings, and also perform a scan inthe parameter space of a string inspired St\"uckelberg model. $Z'$-explorer 2.0is publicly available on GitHub.

$Z'$-explorer 2.0: reconnoitering the dark matter landscape