diff --git a/app/assets/javascripts/workers/worker_world.js b/app/assets/javascripts/workers/worker_world.js
index 7cb6da6a6..d2eef4170 100644
--- a/app/assets/javascripts/workers/worker_world.js
+++ b/app/assets/javascripts/workers/worker_world.js
@@ -507,6 +507,11 @@ self.onWorldError = function onWorldError(error) {
   }
   else {
     console.log("Non-UserCodeError:", error.toString() + "\n" + error.stack || error.stackTrace);
+    if(self.world.indefiniteLength) {
+      // We don't abort completely, since the player can always click to end the game.
+      // TODO: some better error to the user would be nice, though.
+      return true;
+    }
     self.postMessage({type: 'non-user-code-problem', problem: {message: error.toString()}});
     return false;
   }
diff --git a/app/lib/Angel.coffee b/app/lib/Angel.coffee
index d440a3086..3b2b94045 100644
--- a/app/lib/Angel.coffee
+++ b/app/lib/Angel.coffee
@@ -234,7 +234,7 @@ module.exports = class Angel extends CocoClass
     @running = false
     @work = null
     @streamingWorld = null
-    @deserializationQueue = null
+    @deserializationQueue = []
     _.remove @shared.busyAngels, @
     @abortTimeout = _.delay @fireWorker, @abortTimeoutDuration
     @aborting = true
@@ -254,7 +254,7 @@ module.exports = class Angel extends CocoClass
     @initialized = false
     @work = null
     @streamingWorld = null
-    @deserializationQueue = null
+    @deserializationQueue = []
     @hireWorker() if rehire
 
   hireWorker: ->
diff --git a/app/models/User.coffee b/app/models/User.coffee
index 3d2b1f15b..e9705f3db 100644
--- a/app/models/User.coffee
+++ b/app/models/User.coffee
@@ -196,8 +196,8 @@ module.exports = class User extends CocoModel
     group = me.get('testGroupNumber') % 3
     @hintsGroup = switch group
       when 0 then 'no-hints'
-      when 1 then 'hints'
-      when 2 then 'hintsB'
+      when 1 then 'hints'   # Automatically created code, doled out line-by-line, without full solutions
+      when 2 then 'hintsB'  # Manually created FAQ-style hints, reusable across levels
     @hintsGroup = 'hints' if me.isAdmin()
     application.tracker.identify hintsGroup: @hintsGroup unless me.isAdmin()
     @hintsGroup
diff --git a/app/views/play/level/tome/TomeView.coffee b/app/views/play/level/tome/TomeView.coffee
index aebf5fb27..a57e3873f 100644
--- a/app/views/play/level/tome/TomeView.coffee
+++ b/app/views/play/level/tome/TomeView.coffee
@@ -139,7 +139,8 @@ module.exports = class TomeView extends CocoView
   onSpellLoaded: (e) ->
     for spellID, spell of @spells
       return unless spell.loaded
-    @cast()
+    justBegin = @options.level.isType('game-dev')
+    @cast false, false, justBegin
 
   onCastSpell: (e) ->
     # A single spell is cast.
diff --git a/scripts/addZenProspectLeadsToClose.js b/scripts/addZenProspectLeadsToClose.js
index ce44237d6..ea2c2749d 100644
--- a/scripts/addZenProspectLeadsToClose.js
+++ b/scripts/addZenProspectLeadsToClose.js
@@ -232,10 +232,10 @@ function getZPContacts(done) {
         const emailContactMap = {};
         for (const contact of contacts) {
           if (!contact.organization || !contact.name || !contact.email) {
-            console.log(JSON.stringify(contact, null, 2));
-            return done(`DEBUG: missing data for zp contact:`);
+            console.log(`DEBUG: missing data for zp contact ${contact.email}:`);
+            // console.log(JSON.stringify(contact, null, 2));
           }
-          if (!emailContactMap[contact.email]) {
+          else if (!emailContactMap[contact.email]) {
             emailContactMap[contact.email] = contact;
           }
           // else {
diff --git a/scripts/followupCloseIoLeads.js b/scripts/followupCloseIoLeads.js
index dde6feb4b..1334c605a 100644
--- a/scripts/followupCloseIoLeads.js
+++ b/scripts/followupCloseIoLeads.js
@@ -15,11 +15,21 @@ if (process.argv.length !== 7) {
 // TODO: update status after adding a call task
 
 const createTeacherEmailTemplatesAuto1 = ['tmpl_i5bQ2dOlMdZTvZil21bhTx44JYoojPbFkciJ0F560mn', 'tmpl_CEZ9PuE1y4PRvlYiKB5kRbZAQcTIucxDvSeqvtQW57G'];
-const demoRequestEmailTemplatesAuto1 = ['tmpl_s7BZiydyCHOMMeXAcqRZzqn0fOtk0yOFlXSZ412MSGm', 'tmpl_cGb6m4ssDvqjvYd8UaG6cacvtSXkZY3vj9b9lSmdQrf'];
+const demoRequestEmailTemplatesAuto1 = [
+  'tmpl_s7BZiydyCHOMMeXAcqRZzqn0fOtk0yOFlXSZ412MSGm', // (Auto1) Demo Request Long
+  'tmpl_cGb6m4ssDvqjvYd8UaG6cacvtSXkZY3vj9b9lSmdQrf', // (Auto1) Demo Request Short
+  'tmpl_2hV6OdOXtsObLQK9qlRdpf0C9QKbER06T17ksGYOoUE', // (Auto1) Demo Request With Questions
+  'tmpl_Q0tweZ5H4xs2E489KwdYj3HET9PpzkQ7jgDQb9hOMTR', // (Auto1) Demo Request Without Questions
+];
 const createTeacherInternationalEmailTemplateAuto1 = 'tmpl_8vsXwcr6dWefMnAEfPEcdHaxqSfUKUY8UKq6WfReGqG';
 const demoRequestInternationalEmailTemplateAuto1 = 'tmpl_nnH1p3II7G7NJYiPOIHphuj4XUaDptrZk1mGQb2d9Xa';
 const createTeacherEmailTemplatesAuto2 = ['tmpl_pGPtKa07ioISupdSc1MAzNC57K40XoA4k0PI1igi8Ec', 'tmpl_AYAcviU8NQGLbMGKSp3EmcBLha0gQw4cHSOR55Fmoha'];
-const demoRequestEmailTemplatesAuto2 = ['tmpl_HJ5zebh1SqC1QydDto05VPUMu4F7i5M35Llq7bzgfTw', 'tmpl_dmnK7IVpkyYfPYAl1rChhm9lClH5lJ9pQAZoPr7cvLt'];
+const demoRequestEmailTemplatesAuto2 = [
+  'tmpl_dmnK7IVpkyYfPYAl1rChhm9lClH5lJ9pQAZoPr7cvLt', // (Auto2) Demo Request Long
+  'tmpl_HJ5zebh1SqC1QydDto05VPUMu4F7i5M35Llq7bzgfTw', // (Auto2) Demo Request Short
+  'tmpl_oMH8Gqsh3dPl17FsBrz8dIF14sfTiySASDkmzyRlpWg', // (Auto2) Demo Request With Questions
+  'tmpl_JuuQsQhWNpDMYmN9rwD5Kk7oBELVZI4fMmJNUQC7A8j', // (Auto2) Demo Request Without Questions
+];
 const createTeacherInternationalEmailTemplatesAuto2 = ['tmpl_a6Syzzy6ri9MErfXQySM5UfaF5iNIv1VCArYowAEICT', 'tmpl_jOqWLgT0G19Eqs7qZaAeNwtiull7UrSX4ZuvkYRM2gC'];
 const demoRequestInternationalEmailTemplatesAuto2 = ['tmpl_wz4SnDZMjNmAhp3MIuZaSMmjJTy5IW75Rcy3MYGb6Ti', 'tmpl_5oJ0YQMZFqNi3DgW7hplD6JS2zHqkB4Gt7Fj1u19Nks'];
 
diff --git a/scripts/updateCloseIoLeads.js b/scripts/updateCloseIoLeads.js
index 6a1ca5d9f..2c79b09d1 100644
--- a/scripts/updateCloseIoLeads.js
+++ b/scripts/updateCloseIoLeads.js
@@ -14,6 +14,7 @@ if (process.argv.length !== 10) {
 // TODO: Reduce response data via _fields param
 // TODO: Assumes 1:1 contact:email relationship (Close.io supports multiple emails for a single contact)
 // TODO: Cleanup country/status lookup code
+// TODO: parallelize update leads
 
 // Save as custom fields instead of user-specific lead notes (also saving nces_ props)
 const commonTrialProperties = ['organization', 'district', 'city', 'state', 'country'];
@@ -30,7 +31,11 @@ const customFieldsToRemove = [
 const leadsToSkip = ['6 sınıflar', 'fdsafd', 'ashtasht', 'matt+20160404teacher3 school', 'sdfdsf', 'ddddd', 'dsfadsaf', "Nolan's School of Wonders", 'asdfsadf'];
 
 const createTeacherEmailTemplatesAuto1 = ['tmpl_i5bQ2dOlMdZTvZil21bhTx44JYoojPbFkciJ0F560mn', 'tmpl_CEZ9PuE1y4PRvlYiKB5kRbZAQcTIucxDvSeqvtQW57G'];
-const demoRequestEmailTemplatesAuto1 = ['tmpl_s7BZiydyCHOMMeXAcqRZzqn0fOtk0yOFlXSZ412MSGm', 'tmpl_cGb6m4ssDvqjvYd8UaG6cacvtSXkZY3vj9b9lSmdQrf'];
+const demoRequestEmailTemplatesAuto1 = [
+  'tmpl_cGb6m4ssDvqjvYd8UaG6cacvtSXkZY3vj9b9lSmdQrf', // (Auto1) Demo Request Short
+  'tmpl_2hV6OdOXtsObLQK9qlRdpf0C9QKbER06T17ksGYOoUE', // (Auto1) Demo Request With Questions
+  'tmpl_Q0tweZ5H4xs2E489KwdYj3HET9PpzkQ7jgDQb9hOMTR', // (Auto1) Demo Request Without Questions
+];
 const createTeacherInternationalEmailTemplateAuto1 = 'tmpl_8vsXwcr6dWefMnAEfPEcdHaxqSfUKUY8UKq6WfReGqG';
 const demoRequestInternationalEmailTemplateAuto1 = 'tmpl_nnH1p3II7G7NJYiPOIHphuj4XUaDptrZk1mGQb2d9Xa';
 const createTeacherNlEmailTemplatesAuto1 = ['tmpl_yf9tAPasz8KV7L414GhWWIclU8ewclh3Z8lCx2mCoIU', 'tmpl_OgPCV2p59uq0daVuUPF6r1rcQkxJbViyZ1ZMtW45jY8'];
@@ -946,7 +951,7 @@ function updateLeads(leads, done) {
         tasks.push(createFindExistingLeadFn(email.toLowerCase(), name.toLowerCase(), existingLeads));
       }
     }
-    async.series(tasks, (err, results) => {
+    async.parallel(tasks, (err, results) => {
       if (err) return done(err);
       const tasks = [];
       for (const name in leads) {