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Hero Mastery
Tinker
A nonstop nuker: Rearm resets Laser + Missile (and item) cooldowns, so as long as mana holds you fire spells again and again.
Mastery parameters
Your GPM, last hits and damage per game against other Tinker players — average vs Top 20%.
Members onlyLearning journey
- 1 Know the kit
- 2 Win the lane
- 3 Timing & rotations
- 4 Win the fights
- 5 Master
5 stages, each with one target from your own games and one short quiz. Make Tinker your mastery hero to start — progress shows on Home and Arcana.
Sign in through SteamPhase by phase
The 1v1: last hits + rune control
You 70%Team 30%
Skills in lane — Pro cores max March of the Machines (W) first — 99% of 127 games since patch 7.41, then Laser (Q). First talent at level 11.
Level 6 — Rearm — Rearm turns you into a nuke engine: reset Laser + Missiles to chain burst. With enough mana, one squishy target won't survive.
Boots of Travel + Blink online — Travel + Blink (reset by Rearm) let you push every lane and escape ganks at will. Your split-push is uncatchable.
Skills 1–7
1
2- 3
4- 5
6- 7
Starting items
Iron Branch52%
Observer Ward15%
Tango15%
Faerie Fire13%
Circlet of Nobility2%
Mantle of Intelligence1%
Pros buy this phase
Kaya83%
Blink Dagger16%
Power Treads1%
The Midlaner's job this phase
- Focus on last hits & denies — a 10-creep lead by minute 5 is a real level advantage.
- Minutes 6, 8, 10, …: check water/power runes. A full Bottle means you can spam spells.
- Ask a support to arrive 30 seconds before power runes when your lane is rough.
Tinker
Counters & weaknesses
Channeling heroMagic burst heroFragile hero (easy to catch)
The items that shut Tinker down, 3 heroes that trouble it, and your answer when you play it.
Members onlyWhy this way? How OpenAI Five learned
One hero, one role first
OpenAI's first bot played only Shadow Fiend, only mid, until it mastered it. Stay on Tinker in one role before moving on.
Small, measurable rewards
OpenAI Five was rewarded for last hits and staying alive long before it understood winning. That's why each journey stage has one number to hit.
From yourself to the team
Its 'team spirit' rose over the game: early on, look after yourself; late, play for the team. Each phase's meter shows the split.
Use proven builds
OpenAI Five's builds were hand-written, not trial and error. Start from the pro build, then experiment.
Phase items: what pros buy on this hero (OpenDota). Parameters: percentiles of players on this hero (OpenDota). Item effects checked against Valve's own item data.