diff --git a/src/action-queue.lua b/src/action-queue.lua
index f9e2677..39756df 100644
--- a/src/action-queue.lua
+++ b/src/action-queue.lua
@@ -26,6 +26,10 @@ function actionQueue:upsert(id, maxTimeMs, action)
     }
 end
 
+--- The new action will not be added if an entry with the current id already exists in the queue.
+---@param id any
+---@param maxTimeMs number
+---@param action Action
 function actionQueue:newOnly(id, maxTimeMs, action)
     if self.queue[id] then
         return
@@ -38,6 +42,7 @@ end
 
 --- Must be called on every playdate.update() to check for (and run) any waiting tasks.
 --- Actions that return NeedsMoreTime will not be removed from the queue unless they have expired.
+---@param deltaSeconds number
 function actionQueue:runWaiting(deltaSeconds)
     local currentTimeMs = playdate.getCurrentTimeMilliseconds()
 
diff --git a/src/announcer.lua b/src/announcer.lua
index 971848d..130d10e 100644
--- a/src/announcer.lua
+++ b/src/announcer.lua
@@ -52,6 +52,8 @@ function Announcer:say(text)
     end
 end
 
+---@param x number
+---@param y number
 function Announcer:draw(x, y)
     if #self.textQueue == 0 then
         return
diff --git a/src/baserunning.lua b/src/baserunning.lua
index e9094f9..23524dd 100644
--- a/src/baserunning.lua
+++ b/src/baserunning.lua
@@ -21,8 +21,9 @@ Baserunning = {}
 -- TODO: Implement slides? Would require making fielders' gloves "real objects" whose state is tracked.
 
 ---@param announcer Announcer
+---@param onThirdOutCallback fun()
 ---@return Baserunning
-function Baserunning.new(announcer, onThirdOut)
+function Baserunning.new(announcer, onThirdOutCallback)
     local o = setmetatable({
         runners = {},
         outRunners = {},
@@ -32,7 +33,7 @@ function Baserunning.new(announcer, onThirdOut)
         --- it seems sensible to store the value here.
         outs = 0,
         announcer = announcer,
-        onThirdOut = onThirdOut,
+        onThirdOut = onThirdOutCallback,
     }, { __index = Baserunning })
 
     o:pushNewBatter()
@@ -133,6 +134,9 @@ function Baserunning:convertBatterToRunner()
     self.batter = nil -- Demote batter to a mere runner
 end
 
+---@param deltaSeconds number
+---@param runner Runner
+---@return boolean isStillWalking
 local function walkWayOutRunner(deltaSeconds, runner)
     if runner.x < C.Screen.W + 50 and runner.y < C.Screen.H + 50 then
         runner.x = runner.x + (deltaSeconds * 25)
@@ -156,7 +160,7 @@ function Baserunning:walkAwayOutRunners(deltaSeconds)
     end
 end
 
----@return Runner
+---@return Runner theBatterPushed
 function Baserunning:pushNewBatter()
     local new = {
         -- imageSet = math.random() < C.WokeMeter and FemmeSet or MascSet, -- TODO? lol.
@@ -182,6 +186,7 @@ end
 ---@param runner Runner | nil
 ---@param runnerIndex number | nil May only be nil if runner == batter
 ---@param appliedSpeed number
+---@param isAutoRun boolean
 ---@param deltaSeconds number
 ---@return boolean runnerMoved, boolean runnerScored
 function Baserunning:updateRunner(runner, runnerIndex, appliedSpeed, isAutoRun, deltaSeconds)
@@ -248,7 +253,9 @@ end
 --- Update non-batter runners.
 --- Returns true only if at least one of the given runners moved during this update
 ---@param appliedSpeed number | fun(runner: Runner): number
+---@param forcedOnly boolean If true, only move forced runners (e.g. for a walk)
 ---@param isAutoRun boolean If true, does not attempt to hug the bases
+---@param deltaSeconds number
 ---@return boolean runnersStillMoving, number runnersScored, number secondsSinceLastMove
 function Baserunning:updateNonBatterRunners(appliedSpeed, forcedOnly, isAutoRun, deltaSeconds)
     local runnersStillMoving = false
diff --git a/src/control-screen.lua b/src/control-screen.lua
index 9a224e3..950e5c4 100644
--- a/src/control-screen.lua
+++ b/src/control-screen.lua
@@ -52,7 +52,7 @@ local function detail(text)
     return { text = text, font = DetailFont }
 end
 
----@class
+---@class ControlScreen
 ---@field sceneToReturnTo Scene
 ---@field private renderedImage pd_image Static image doesn't need to be constantly re-rendered.
 ControlScreen = {}
@@ -81,6 +81,7 @@ local function draw()
 end
 
 ---@param sceneToReturnTo Scene
+---@return ControlScreen
 function ControlScreen.new(sceneToReturnTo)
     return setmetatable({
         sceneToReturnTo = sceneToReturnTo,
diff --git a/src/dbg.lua b/src/dbg.lua
index 7005789..a5c4740 100644
--- a/src/dbg.lua
+++ b/src/dbg.lua
@@ -16,7 +16,8 @@ function dbg.label(value, name)
     return value
 end
 
--- Only works if called with the bases empty (i.e. the only runner should be the batter.
+--- Only works if called with the bases empty (i.e. the only runner should be the batter.
+---@param br Baserunning
 function dbg.loadTheBases(br)
     br:pushNewBatter()
     br:pushNewBatter()
@@ -73,6 +74,7 @@ local hitSamples = {
     },
 }
 
+---@param inningCount number Number of innings to mock
 ---@return Statistics
 function dbg.mockStatistics(inningCount)
     inningCount = inningCount or 9
diff --git a/src/main-menu.lua b/src/main-menu.lua
index f64e036..167418e 100644
--- a/src/main-menu.lua
+++ b/src/main-menu.lua
@@ -41,6 +41,8 @@ local function startGame()
     MenuMusic:setPaused(true)
 end
 
+---@param baseEaser EasingFunc
+---@return EasingFunc
 local function pausingEaser(baseEaser)
     --- t: elapsedTime
     --- d: duration
@@ -65,6 +67,7 @@ local animatorY = gfx.animator.new(2000, 60, 200, pausingEaser(utils.easingHill)
 animatorY.repeatCount = -1
 animatorY.reverses = true
 
+---@type number
 local crankStartPos
 
 ---@generic T
@@ -76,6 +79,7 @@ local function arrayElementFromCrank(array, crankPosition)
     return array[i]
 end
 
+---@type pd_image
 local currentLogo
 
 --luacheck: ignore
diff --git a/src/main.lua b/src/main.lua
index 685e945..1e057f9 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -406,15 +406,7 @@ function Game:updateBatting(offenseHandler)
 
     local ballWasHit = batSpeed > 0
         and ball.y < 232
-        and utils.pointDirectlyUnderLine(
-            ball.x,
-            ball.y,
-            self.state.batBase.x,
-            self.state.batBase.y,
-            self.state.batTip.x,
-            self.state.batTip.y,
-            C.Screen.H
-        )
+        and utils.pointDirectlyUnderLine(ball, self.state.batBase, self.state.batTip, C.Screen.H)
 
     if not ballWasHit then
         return
@@ -472,6 +464,8 @@ function Game:updateBatting(offenseHandler)
 end
 
 ---@param appliedSpeed number | fun(runner: Runner): number
+---@param forcedOnly boolean
+---@param isAutoRun boolean
 ---@return boolean runnersStillMoving, number secondsSinceLastRunnerMove
 function Game:updateNonBatterRunners(appliedSpeed, forcedOnly, isAutoRun)
     local runnersStillMoving, runnersScored, secondsSinceLastRunnerMove =
@@ -649,10 +643,12 @@ function Game:update()
     if self.state.offenseState == C.Offense.batting then
         gfx.setLineWidth(7)
         gfx.drawLine(self.state.batBase.x, self.state.batBase.y, self.state.batTip.x, self.state.batTip.y)
+
         gfx.setColor(gfx.kColorWhite)
         gfx.setLineCapStyle(gfx.kLineCapStyleRound)
         gfx.setLineWidth(3)
         gfx.drawLine(self.state.batBase.x, self.state.batBase.y, self.state.batTip.x, self.state.batTip.y)
+
         gfx.setColor(gfx.kColorBlack)
     end
 
@@ -681,6 +677,7 @@ function Game:update()
     if math.abs(offsetX) > 10 or math.abs(offsetY) > 10 then
         drawMinimap(self.baserunning.runners, self.fielding.fielders)
     end
+
     local homeScore, awayScore = utils.totalScores(self.state.stats)
     drawScoreboard(
         0,
diff --git a/src/npc.lua b/src/npc.lua
index be0eb24..897076c 100644
--- a/src/npc.lua
+++ b/src/npc.lua
@@ -21,11 +21,11 @@ end
 function Npc.update() end
 
 -- TODO: FAR more nuanced NPC batting.
+-- luacheck: no unused
 ---@param ball XyPair
 ---@param pitchIsOver boolean
 ---@param deltaSec number
 ---@return number batAngleDeg, number batSpeed
--- luacheck: no unused
 function Npc:updateBat(ball, pitchIsOver, deltaSec)
     if not pitchIsOver and ball.y > 200 and ball.y < 230 and (ball.x < C.Center.x + 15) then
         npcBatDeg = npcBatDeg + (deltaSec * npcBatSpeed)
@@ -36,10 +36,12 @@ function Npc:updateBat(ball, pitchIsOver, deltaSec)
     return npcBatDeg, (self:batSpeed() * deltaSec)
 end
 
+---@return number
 function Npc:batSpeed()
     return npcBatSpeed / 1.5
 end
 
+---@return number flyTimeMs, number pitchId, number accuracy
 function Npc:pitch()
     return C.PitchFlyMs / self:pitchSpeed(), math.random(#Pitches), 0.9
 end
diff --git a/src/pitching.lua b/src/pitching.lua
index 18d9aa3..893eaa6 100644
--- a/src/pitching.lua
+++ b/src/pitching.lua
@@ -7,6 +7,8 @@ local gfx <const> = playdate.graphics
 local StrikeZoneWidth <const> = C.StrikeZoneEndX - C.StrikeZoneStartX
 
 -- TODO? Also degrade speed
+---@param accuracy number
+---@return number xValueToMissBy
 function getPitchMissBy(accuracy)
     accuracy = accuracy or 1.0
     local missBy = (1 - accuracy) * StrikeZoneWidth * 3
@@ -71,6 +73,9 @@ Pitches = {
     end,
 }
 
+---@alias PitchOutcome "StrikeOut" | "Walk"
+
+---@type table<string, PitchOutcome>
 PitchOutcomes = {
     StrikeOut = "StrikeOut",
     Walk = "Walk",
@@ -93,6 +98,7 @@ function pitchTracker:reset()
     self.balls = 0
 end
 
+---@param ball XyPair
 function pitchTracker:recordIfPassed(ball)
     if ball.y < C.StrikeZoneStartY then
         self.recordedPitchX = nil
@@ -103,6 +109,7 @@ end
 
 ---@param didSwing boolean
 ---@param fieldingTeamInningData TeamInningData
+---@return PitchOutcome | nil
 function pitchTracker:updatePitchCounts(didSwing, fieldingTeamInningData)
     if not self.recordedPitchX then
         return
@@ -149,8 +156,6 @@ throwMeter = {
     wasPerfect = false,
 }
 
-local crankQueue = {}
-
 local MaxPowerRatio <const> = 1.5
 
 --- Returns nil when a throw is NOT requested.
@@ -176,6 +181,11 @@ end
 
 local CrankRecordSec <const> = 0.33
 
+---@alias CrankQueueEntry { time: number, chargeAmount: number }
+
+---@type CrankQueueEntry[]
+local crankQueue = {}
+
 --- If (within approx. a third of a second) the crank has moved more than 45 degrees, call that a throw.
 ---@param chargeAmount number
 ---@return number | nil
diff --git a/src/statistics.lua b/src/statistics.lua
index fb61a2f..b2f210c 100644
--- a/src/statistics.lua
+++ b/src/statistics.lua
@@ -5,6 +5,7 @@
 --   + Batting average
 --   + Farthest hit ball
 
+---@return TeamInningData
 local function newTeamInning()
     return {
         score = 0,
diff --git a/src/user-input.lua b/src/user-input.lua
index 02a78b9..0f34ee2 100644
--- a/src/user-input.lua
+++ b/src/user-input.lua
@@ -2,6 +2,7 @@
 ---@field buttonControlledThrow: fun(throwFlyMs: number, forbidThrowHome: boolean): boolean didThrow
 UserInput = {}
 
+---@return UserInput
 function UserInput.new(buttonControlledThrow)
     return setmetatable({
         buttonControlledThrow = buttonControlledThrow,
@@ -14,6 +15,7 @@ function UserInput:update()
     self.crankLimited = math.abs(crankLimited)
 end
 
+---@return number batAngleDeg, number batSpeed
 function UserInput:updateBat()
     local batAngleDeg = (playdate.getCrankPosition() + C.CrankOffsetDeg) % 360
     local batSpeed = self.crankLimited
@@ -43,6 +45,7 @@ local function userPitch(throwFlyMs, accuracy)
     return nil, nil, nil
 end
 
+---@return number | nil pitchFlyTimeMs, number | nil pitchTypeIndex, number | nil accuracy
 function UserInput:pitch()
     local powerRatio, accuracy = throwMeter:readThrow(self.crankChange)
     if powerRatio then
diff --git a/src/utils.lua b/src/utils.lua
index 5bc364b..ba0643c 100644
--- a/src/utils.lua
+++ b/src/utils.lua
@@ -90,8 +90,12 @@ function utils.moveAtSpeed(mover, speed, target, tau)
     return true
 end
 
-function utils.within(within, n1, n2)
-    return math.abs(n1 - n2) < within
+---@param acceptableGap number
+---@param n1 number
+---@param n2 number
+---@return boolean n1 is within acceptableGap of n2
+function utils.within(acceptableGap, n1, n2)
+    return math.abs(n1 - n2) < acceptableGap
 end
 
 ---@generic T
@@ -121,6 +125,10 @@ function utils.first(array, condition)
     return nil
 end
 
+---@param x1 number
+---@param y1 number
+---@param x2 number
+---@param y2 number
 ---@return number distance, number x, number y
 function utils.distanceBetween(x1, y1, x2, y2)
     local x = x1 - x2
@@ -137,6 +145,12 @@ function utils.distanceBetweenPoints(point1, point2)
     return sqrt((x * x) + (y * y)), x, y
 end
 
+---@param x1 number
+---@param y1 number
+---@param z1 number
+---@param x2 number
+---@param y2 number
+---@param z2 number
 ---@return number distance, number x, number y, number z
 function utils.distanceBetweenZ(x1, y1, z1, x2, y2, z2)
     local x = x1 - x2
@@ -164,15 +178,19 @@ function utils.getRunnerWithNextBase(runners, base)
 end
 
 --- Returns true only if the point is below the given line, within the x bounds of said line, and above the bottomBound.
+---@param point XyPair
+---@param line1 XyPair
+---@param line2 XyPair
+---@param bottomBound number
 ---@return boolean
-function utils.pointDirectlyUnderLine(pointX, pointY, lineX1, lineY1, lineX2, lineY2, bottomBound)
+function utils.pointDirectlyUnderLine(point, line1, line2, bottomBound)
     -- This check currently assumes right-handedness.
     -- I.e. it assumes the ball is to the right of batBaseX
-    if pointX < lineX1 or pointX > lineX2 or pointY > bottomBound then
+    if point.x < line1.x or point.x > line2.x or point.y > bottomBound then
         return false
     end
 
-    return utils.pointUnderLine(pointX, pointY, lineX1, lineY1, lineX2, lineY2)
+    return utils.pointUnderLine(point.x, point.y, line1.x, line1.y, line2.x, line2.y)
 end
 
 --- Returns true if the given point is anywhere above the given line, with no upper bound.
@@ -192,6 +210,12 @@ function utils.pointIsSquarelyAboveLine(point, linePoints)
 end
 
 --- Returns true only if the point is below the given line.
+---@param pointX number
+---@param pointY number
+---@param lineX1 number
+---@param lineY1 number
+---@param lineX2 number
+---@param lineY2 number
 ---@return boolean
 function utils.pointUnderLine(pointX, pointY, lineX1, lineY1, lineX2, lineY2)
     local m = (lineY2 - lineY1) / (lineX2 - lineX1)
@@ -222,6 +246,7 @@ end
 ---@param array T[]
 ---@param x number
 ---@param y number
+---@param extraCondition fun(t: T): boolean
 ---@return T nearest,number |nil distance
 function utils.getNearestOf(array, x, y, extraCondition)
     local nearest, nearestDistance = nil, nil