  Novel collision methods and rich phenomena are crucial to keeping high-energy
collision physics more robust and attractive. In this document, we present a
staged blueprint for future high-energy colliders: from neutrino-neutrino
collision, neutrino-lepton collision to electron-muon and muon-muon collisions.
Neutrino beam from TeV scale muons is a good candidate to enrich high-energy
collision programs and can serve as a practical step toward a high-energy muon
collider, which still requires tens of years of R&D. Neutrinos-neutrinos
collision provides a promising way to probe heavy Majorana neutrinos and
effective neutrino mass; neutrino and antineutrino annihilation into Z boson
has a huge cross-section at 10K pb level; leptons-neutrinos collision benefits
W boson mass precision measurements. With only a minimal amount of integrated
luminosity, one can envision the ``Richness out of smallness''. This document
summarizes the current status and the roadmap towards the muon-muon collider
with less challenging techniques required through intermediate facilities,
where a wide variety of physics goals could be achieved. A (preparatory)
laboratory on novel colliders could attract vast international interests and
collaborations.
