diff --git a/js/game.js b/js/game.js
index a7d835f..378d1ee 100644
--- a/js/game.js
+++ b/js/game.js
@@ -1266,6 +1266,7 @@ export class Level extends LevelInterface {
             // At this point, we have exactly 1 or 2 directions, and deciding between them requires
             // checking which ones are blocked.  Note that we do this even if only one direction is
             // requested, meaning that we get to push blocks before anything else has moved!
+            let push_mode = this.compat.no_early_push ? 'bump' : 'push';
             let open;
             if (dir2 === null) {
                 // Only one direction is held, but for consistency, "check" it anyway
diff --git a/js/main.js b/js/main.js
index 7071c16..220bc5a 100644
--- a/js/main.js
+++ b/js/main.js
@@ -2890,6 +2890,11 @@ const COMPAT_FLAGS = [{
     label: "Player pulls blocks at decision time",
     // TODO maybe steam as well?
     rulesets: new Set(['steam-strict']),
+}, {
+    key: 'blue_keys_not_edible',
+    label: "Monsters do not eat blue keys",
+    // TODO wonder if this should also remove the special behavior of red keys
+    rulesets: new Set(['ms']),
 }, {
     // XXX this is goofy
     key: 'tiles_react_instantly',
@@ -2910,6 +2915,10 @@ const COMPAT_FLAGS = [{
     key: 'use_lynx_loop',
     label: "Use Lynx-style update loop",
     rulesets: new Set(['steam', 'steam-strict', 'lynx', 'ms']),
+}, {
+    key: 'no_early_push',
+    label: "Player doesn't push at decision time",
+    rulesets: new Set(['lynx', 'ms']),
 }, {
     key: 'emulate_60fps',
     label: "Run at 60 FPS",
diff --git a/js/tiletypes.js b/js/tiletypes.js
index 07477ab..d4664db 100644
--- a/js/tiletypes.js
+++ b/js/tiletypes.js
@@ -2215,7 +2215,7 @@ const TILE_TYPES = {
             // actors who aren't supposed to have an inventory
             // TODO make this a...  flag?  i don't know?
             // TODO major difference from lynx...
-            if (other.type.name !== 'ice_block' && other.type.name !== 'frame_block') {
+            if (other.type.name !== 'ice_block' && other.type.name !== 'frame_block' && ! level.compat.blue_keys_not_edible) {
                 level.attempt_take(other, me);
             }
         },